Please take a look at the video above from our founder, Tim Buchalka.
In it he discusses our free programming career guide, our fifty two courses,
and what we believe is the most important skill you need to have to
succeed as a programmer (it’s probably not what you think).
Gain Clarity on your career in Programming.
The Only Programming Career Guide You’ll Ever Need
Java Programming Masterclass updated to Java 17
734999
studentsNovember 2022 UPDATE – MASSIVE NEW UPDATE FOR JAVA 17 IS LIVE! Read below to find out why you want to be learning Java 17 and not another version....
Free
Learn Python Programming Masterclass
394804
studentsWhether you want to: – build the skills you need to get your first Python programming job – move to a more senior software developer...
Free
Beginning C++ Programming – From Beginner to Beyond
227603
studentsWhich programming language is often seen as a badge of honor among software developers? C++ Which programming language can you learn that when added...
Free
SQL for Beginners: Learn SQL using MySQL and Database Design
128825
studentsHave you heard that database skills are essential for developers to be skilled in and understand? Are you wanting to understand SQL and databases...
Free
C Programming For Beginners – Master the C Language
126502
studentsHave you never programmed a computer before, and think or have been told that C is a good programming language to get started with. It is!...
Free
Data Structures and Algorithms: Deep Dive Using Java
85646
studentsSo you’ve worked with the basics of data structures and algorithms in Java (or another OO programming language) but feel like you need a deeper...
Free
Android Java Masterclass – Become an App Developer
67811
studentsThere’s no getting around it. Android accounts for 81.7% of all smartphones sold, but not all come packed with the very latest Android Nougat....
Free
Android App Development Masterclass using Kotlin
38271
studentsWhat do you get in this course? In this course, you will discover the power of Android app development, and obtain the skills to dramatically...
Free
Java Spring Tutorial Masterclass – Learn Spring Framework 5
37502
studentsThere is no doubt that having Spring Framework skills on your résumé will make you a more employable Java developer. Spring developers are in...
Free
Advanced C Programming Course
24050
studentsWhat you will learn in this course? The C programming language in 2020 is still one of the most popular and widely used languages....
Free
The Complete Xamarin Developer Course: iOS And Android!
23375
studentsSo you’ve learnt some programming, but are struggling to get an interview, let alone a job. Or you are stuck in a low paying programming...
Free
Oracle Java Certification – Pass the Associate 1Z0-808 Exam.
22790
studentsSo you’ve learnt some Java, but are struggling to get an interview, let alone a job. Or you are stuck in a low paying programming...
Free
Kotlin for Java Developers
22196
studentsAre you a Java developer wondering if you need to learn Kotlin? Maybe you are an experienced Java developer who wants to learn Kotlin quickly,...
Free
Master MATLAB through Guided Problem Solving
21316
studentsMATLAB is the premier programming language of scientific computing in university, research, and industry. Excellent MATLAB programming skills can make or break a career...
Free
Java SE 11 Developer 1Z0-819 OCP Course – Part 1
20591
studentsBecoming Java certified is a great way to help improve your career options with more job opportunities and more pay. That’s because Oracle’s Java...
Free
Windows Presentation Foundation Masterclass
19414
studentsDo you know a little programming in C# or another language, but are struggling to get an interview, let alone a job? Maybe you are stuck in...
Free
Learn Java Programming Crash Course
16557
studentsIf you want to learn to program in Java in far less time than you previously thought possible then read on. The world today...
Free
Python REST APIs with Flask, Docker, MongoDB, and AWS DevOps
16363
studentsSo you know a bit of Python and want to learn about RESTful API’s and other cool technologies like Flask, Docker, MongoDB to name...
Free
Java Enterprise Edition 8 for Beginners course
15967
studentsAre you ready to take your Java skills to the next level and finally understand Java Enterprise Edition (JEE) ? The fact is, that...
Free
PHP for Beginners
14060
studentsAre you wanting to get into Web development, but are not sure where to start? So maybe you tried out some PHP and MySQL...
Free
The Java Design Patterns Course
10817
studentsSo you have some Java experience under your belt, but are trying to figure out what to do next to make it easier to...
Free
Java SE 11 Developer 1Z0-819 OCP Course – Part 2
10737
studentsBecoming Java certified is a great way to help improve your career options with more job opportunities and more pay. That’s because Oracle’s Java...
Free
Git & GitHub Masterclass
10205
studentsGit is the most used version control system for programmers in the world. GitHub, with 57 million repositories (projects) and 28 million users is ...
Free
Learn C# for Beginners Crash Course
9031
studentsIf you are like most people wanting to learn a programming language, you don’t have much spare time. What time you have is extremely...
Free
Learn Go for Beginners Crash Course (Golang)
8646
studentsIf you are like most people wanting to learn a programming language, you don’t have much spare time. What time you have is extremely...
Free
Introduction to Continuous Integration & Continuous Delivery
7848
studentsMaybe you’ve heard the terms Continuous Integration and Continuous Delivery before, but have never really had time to find out what they mean, and...
Free
Advanced Algorithms in Java
6686
studentsOnce you know the basics of Java, you will want to start figuring out Algorithms and Data structures. Used correctly, your code will run...
Free
3D Programming with JavaScript and the Three.js 3D Library
6336
studentsDo you want to get into 3D programming with Javascript but don’t know where to start? Maybe you have tried out the Three.js 3D...
Free
The Advanced Xamarin Developer Masterclass
6067
studentsIf you have some existing Xamarin development experience (perhaps completing or done at least done some of Eduardo’s (the courses instructor) Complete Xamarin Course,...
Free
ArcPy for Python Developers using ArcGIS Pro
5605
studentsThe global Geographic Information System (GIS) market is expected to by worth over ten billion dollars by 2023, and is growing at a huge...
Free
What’s New in Java 9 – Modules and More!
5259
studentsDo you know some Java, but worry that with the recent release of Java 9, your skills are now outdated? Maybe you are a programmer...
Free
Python Tkinter Masterclass – Learn Python GUI Programming
4992
studentsHave you done some Python programming but want to take your skills to the next level? Maybe you just want to add GUI programming to...
Free
Ethical Hacking Course: Protect Yourself From Being Hacked
4966
studentsSo you want to get a job in Information Technology security, but are struggling to get an interview, let alone a job. Or you got hacked,...
Free
Python GUI Programming Using PyQt5
4699
studentsPython programmers are among the highest paid developers on the planet. Lots of programmers are trying to build an edge as Python developers in...
Free
Machine Learning with Python from Scratch
4453
studentsMachine Learning is a hot topic! Python Developers who understand how to work with Machine Learning are in high demand. But how do you get...
Free
Azure Machine Learning using Cognitive Services
4075
studentsHas Microsoft’s Cognitive services piqued your interest, but you haven’t been able to find a decent course that will teach you how to use...
Free
Rust Programming Language for Beginners
3946
studentsWhy learn Rust? Firstly, Rust is hot. Clients are screaming for Rust developers, so if you learn this language there is little doubt you will have...
Free
Learn Java Creating Android Games Using the LibGDX library
3267
studentsGames developers are in huge demand, with many new and exciting opportunities becoming available to programmers who understand the technology. Are you looking to...
Free
Android Firebase Masterclass – Master Google Firebase
2567
studentsWhat you will learn in this course? In this course, you will learn the fundamentals of Firebase and all of its benefits, and then...
Free
Master CI/CD for React Native
2320
studentsWhat you will learn in this course? In this course, you will learn the fundamentals of CI/CD which is short for Continuous Integration/Continuous Delivery...
Free
The Complete Javascript Course for Developers
2301
studentsKnowledge of JavaScript is absolutely essential for a developer in 2018. You’ve arrived on this page, so you are probably aware of that. The fact...
Free
Search Algorithms in Artificial Intelligence with Java
2080
studentsOne area in Java development that is extremely hot right now is Artificial Intelligence. Java developers who understand how to develop Artificial Intelligence (AI)...
Free
HTML and CSS Masterclass
1675
studentsAre you someone who’s interested in web design and development but have no idea where to begin? Perhaps you have heard of HTML and...
Free
Master CI/CD for iOS Developers
1583
studentsWhat you will learn in this course? In this course, you will learn the fundamentals of CI/CD which is short for Continuous Integration/Continuous Delivery...
Free
Python Django 4 Masterclass | Build a Real World Project
1466
studentsWelcome to the Python Django 4 Masterclass, where you will learn Django and create a real-world project. Python is one of, if not the...
Free
Learn Kotlin and Create Games Using the LibGdx Library
1449
studentsGames developers are in huge demand, with many new and exciting opportunities becoming available to programmers who understand the technology. Are you looking to...
Free
Learn To Write 2D Games with C# and Unity
1336
studentsHave you always wanted to create your own games, but don’t know where to start? Maybe you tried out Unity, but could not really...
Free
Mastering Intellij IDEA and Android Studio
1187
studentsHave you used JetBrain’s fantastic IntelliJ IDEA IDE (Integrated Development Environment) and been amazed at the power but wondered how to take advantage of the incredible range...
Free
Master CI/CD for Android Developers
1173
studentsWhat you will learn in this course? In this course, you will learn the fundamentals of CI/CD which is short for Continuous Integration/Continuous Delivery...
Free
Learning Bootstrap – From HTML to WordPress Theme
1072
studentsIf you’re a web or graphic designer who has the desire to revamp your skills and take them it to a whole new level,...
Free
Ruby for Beginners
807
studentsSo maybe you tried out Ruby on Rails, but found it too hard, because you didn’t know the Ruby programming language. Maybe you have...
Free
Ruby on Rails for Beginners
790
studentsSo maybe you tried out Ruby on Rails, but found it too hard and feel that you need a more comprehensive introduction. Maybe you have...
Free
Python Crash Course: Gain Real World Developer Skills Now!
477
studentsIf you want to learn to program in Python in far less time than you previously thought possible then read on. The world today...
Free
Master CI/CD for Xamarin
456
studentsWhat you will learn in this course? In this course, you will learn the fundamentals of CI/CD which is short for Continuous Integration/Continuous Delivery...
Free
iOS Firebase Masterclass – Real time Database and Firestore
338
studentsWhat you will learn in this course? The course is designed to give a comprehensive overview of the Firebase Framework and will teach you...
Free
Kotlin Crash Course: Gain Real World Developer Skills Now!
112
studentsIf you want to learn to program in Kotlin in far less time than you previously thought possible then read on. The world today...
Free
Thomas Oliveira Horta
Kotlin for Java Developers
This course is perfect for anyone that already has a Java background, as it properly uses this knowledge to avoid repeating stuff unnecessarily. If you already know Java, the course is very straight to the point and at the same time is very detailed about new aspects of the Kotlin language. The teacher shows a lot of experience in both Java and Kotlin and don't leave questions unanswered throughout the course. I have to say that this was money well spent, as I am a professional Android Developer and expect to start using Kotlin both in personal and professional projects in the near future.
Mr Sauceeege
Ruby for Beginners
I was not expecting this course to be so in depth. I am glad that I enrolled in this course because in only few minutes I had my machine up and running with the tools I would need for Ruby. The instructor is very good at explaining stuff and showing you ways of coding in Ruby. You can't go wrong with this instructor.
Graziano capannelli
Java Spring Tutorial Masterclass - Learn Spring Framework 5
I have found this course a very good one. I had some experiences with spring, but this course it is full of good examples that can be applicable in real spring projects. So thank you Tim very much. I really enjoyed your course.
G. Houston
Learn Java Creating Android Games Using the LibGDX library
Brilliant course. I love how it's structured. The creation of small sample experiments within a sample browser is particularly handy as it gives us something to refer back to and keeps these samples in one self-contained project. It\'s also a mini productivity Masterclass. I was already familiar with IntelliJ/Android Studio to the point where I could get by without ever using the mouse, and yet I\'ve still learnred tons new tricks for the IDE. Goran certainly knows his stuff, that much is clear! His explanations are easy to understand, and the actual creation of the games is done in a logical progression that makes it enjoyable to follow as the game(s) are built up step by step from things we\'ve learned while builing sample code in previous exercises. I can\'t think of any downsides to taking this course. If you\'re at all interested in making games, libGDX is a very good engine for that. And this course is hands down the best libGDX course available. In the time since its release it\'s only grown better with the addition of an entire section devoted to Java so students can get up to speed with the language quickly.
Tamas Galli
What's New in Java 9 - Modules and More!
Thorough but easy to understand presentation, highlighting many of the new features of Java 9. I really enjoyed the course. Because of the mode of the presentation, the well-grouped material and breaking down the stuff in many small units, it can be of benefit to well-grounded and beginner java programmers, as well. Thanks for the course of this high standard.
Rod Stafford
Android App Development Masterclass using Kotlin
Tim is the best. When I found out he personally was instructing this course I signed up right away. You can tell he pays attention to comments and has a lot of experience teaching by the way he addresses errors, pitfalls, and alternate ways of approaching a problem, and his "homework" problems are actually well tailored to not be too simple or too complicated. Really a pleasure.
Asif Imtiaz Ahmed
Android Java Masterclass - Become an App Developer
I have done some courses with other instructors in and outside of Udemy. One of the main, and in my opinion most treasured aspects of Tim's lectures is that he gives a very detailed and holistic approach to his teachings. I was rarely in a position where I was just memorizing certain parts of a code hoping that it will make sense to me someday. He is so comprehensive that it really helps clear up the concepts. Tim's courses are so so so worth every penny spent! he is thorough and sincere and a wonderful proactive teacher!
Januar Ikmal
SQL for Beginners: Learn SQL using MySQL and Database Design
Great course and great instructor for this course. I'm sure i'm not wasting my money for buying this course because the material content is great and easy to understand for beginner like me. Maybe you should adding more cases and more example for database design section, i think that will completing this course overall.
Steve Thompson
Learn Kotlin and Create Games Using the LibGdx Library
I find the instructor really engaging. I know a lot of the material, having a great deal of programming experience and some Kotlin exposure in the past, but somehow the instructor makes it all fascinating again. While I am not at the point where we are covering libGDX, so far I'm having fun.
Todd Miller
Ethical Hacking Course: Protect Yourself From Being Hacked
Enlightening, explains the theory then deep dives with examples. Knowledgeable instructor, I found this easy to follow and understand. Spent many hours between sessions applying the knowledge in labs...and plan to revisit this course as I continue to apply the knowledge learned. Enjoyed the fact of going over previous setups in order to reinforce what you have learned. This approach worked well for me, but understand where others may which to jump ahead. I would highly recommend the course and Instructor.
G. Houston
Learn To Write 2D Games with C# and Unity
I\'ve tried a couple of other game development courses on Udemy, and Goran Lochert is by far the best instructor in this subject. I first discovered him via in his LibGDX course, and his teaching style and explanations really resonate with me in a way I\'ve not found with other courses. The lessons are structured in a way that makes total sense. He knows exactly when to gloss over things and come back to them later to keep things moving forward, as well as when to stop and take the time to go into a topic in greater depth. When I saw he had a Unity course I couldn\'t resist, had to get it, and I\'m glad I picked it up. Most courses I\'ve encountered prior to this one either have a very short C# primer leaving you hungry for more, or try to teach C# at the same time as they are teaching the engine. By contrast this course starts off with a very comprehensive C# section. And thanks to Goran\'s teaching style, moves forward at a comfortably quick pace. To me, this course is a must buy to anyone who\'s interested in the Unity engine and wants to get a solid understanding of it.
Ebeyrer
The Complete Xamarin Developer Course: iOS And Android!
I was sceptical of buying an online course but this was worth it. Even with the changes to xamarin forms since this was released, I am still able to follow along quite well. So far, my favourite part of the course is the way the instructor pronounces "category". His accent is no hurdle at all and makes the experience unique and interesting
Kevin Freeman
Beginning C++ Programming - From Beginner to Beyond
I love the courses set up by Tim Buchalka. I have used the Python, Java and Android courses. In this C++ course Frank does an excellent job of using slides as an overview and then walking you through and explaining in full detail. As a teacher I can appreciate this approach in trying to reach the various learning needs of all students. Thanks for the hard work guys.
Ruggiero Marco Paolillo
PHP for Beginners
Achieving perfection in a web development course is not an easy task and Dave Hollingwoth did it again. Dave has summarized more than 15 years or so of php web development in this brilliant course (the other course by Dave I suggest is the one about building MVC framework from scratch). In other words i can safely throw away a lot of books I have about PHP and save space on my book shelves :-). The course is perfectly organized. Everything is explained from ground up. The meticulousness of the teaching can be seen in every single topic. I like the gradualism and the speed Dave uses to teach every single topic without spending much time about useless technicalities. Moreover, most importantly, at the end of the entire course you will have a perfectly organized and working WEB application that you can use as a starting pont for further improvements. Even if I am not a beginner and most of the topics explained here are not new to me, I have to admit that I found many tips and good practises useful to my everyday work. Having said that I would recommend this course not only to beginners but also to those like me have developed software using PHP for years now. Last but not least, as I remarked in another review, Dave's English is music to my ears and I think this is rare goods here on Udemy.
Hishamuddien Rumaney
Windows Presentation Foundation Masterclass
Because of how well this course covered WPF and MVVM, I have become very familiar and experienced with WPF and MVVM. I have learnt an enormous amount of useful skills that I can use in my job and beyond. At first MVVM was a very strange aspect to me since I have never encountered it prior to my job and this course but now have a great insight into MVVM. The Instructor Eduardo is really good and takes you through the basics to the more advanced aspects of WPF and MVVM and his lessons engage the learner from the learner's point of view thus covering complicated topics in an easily understandable manner
Oseikhuemen Davis Ojie
Master MATLAB through Guided Problem Solving
At first when I saw it wasn't Tim I was discouraged but I tried it and found out that the saying that eagles associates with eagles is true. Micheal is a bomb!
Adam Hartleb
Rust Programming Language for Beginners
Concepts are clearly explained. The accent takes a bit to get used to but that's okay :). Very well done.
Negib Khalef
Advanced Algorithms in Java
Excellent, just what I need in my arsenal for coding.
Jam Hussein Ahmad
Python REST APIs with Flask, Docker, MongoDB, and AWS DevOps
Overall a really good course. Doesn't cover all topics comprehensively, but covers all topics enough for you to know how to use them and get up to speed on these technologies. Highly recommend the course.
Rafael Vinicius Bento Peppi
Java Programming Masterclass updated to Java 17
Never knew anything about Java, except when Windows asks to do updates, but this course is great. I\\\'m really understanding it!! Great job!!! Tim really explains well. He passes the right amount of information on each lecture. And also the challenges helped me to train my new skills and logic. Goran is also doing a espetacular job at answering questions. After each lecture i check the questions forum. It\\\'s really enlightening! I also do a lot of on-line research about topis. So far it\\\'s been a great experience!! Thank you all for this course! Looking foward to finish this one and start another in this area.
Nijastan Kirupa
Learn Python Programming Masterclass
Great course. It is very comprehensive. I was surprised by how was covered. It covered many expert level topics and gives all the tools to be a proficient Python developer.
Laerte Mancuso Jr.
C Programming For Beginners - Master the C Language
If I had known that this course would be like this, I would have done only this, and not so many others. The instructor has excellent didactics, it is very clear, he is available to solve doubts, and for a beginner course, surely it is very comprehensive.
Thierno Amirou DIALLO
Data Structures and Algorithms: Deep Dive Using Java
This was a great course. I had little knowledge of algorithms and data structures but now I feel confident in pursuing my journey in the programming world. I strongly recommend the course.
Marc Gagliardo
Oracle Java Certification - Pass the Associate 1Z0-808 Exam.
Great instructor, really knows the material well and provides very good examples. I was already familiar with Java coming in, but even I was able to learn a lot of knew things. I would highly recommend this course.
Nishant Dutta
Java Programming Masterclass updated to Java 17
The instructor is very clear and crisp and confident in the content he speaks, really like the way he has given the introduction.
Kanu Emeruwa
Master MATLAB through Guided Problem Solving
Yes, in these introductory lectures I very much appreciate how he has designed this course and the guidance he has provided for success in working through the course.
Tácio Mendes
Android App Development Masterclass using Kotlin
I had a wonderful time learning with Tim, he's a very experienced and fun instructor! 😀 I feel ready to start creating my own apps now!
Ulya Yılmaz
Learn Python Programming Masterclass
It was the perfect match. Couldn't have found a better one if I tried.
Ali Can BATUR
Java Programming Masterclass updated to Java 17
Best Java tutorial I've ever seen, I really like watching the videos and applying the things I learn at the same time. Best in-depth learning experience I've ever seen . Excellent job from Tim Buchalka and I really recommend taking this course. Don't hesitate a second to buy it 🙂
Nitin NEGI
Beginning C++ Programming - From Beginner to Beyond
great job! no word to say about your good work,giving knowledge for all the aspiring students at a very cheap rate.god bless you sir.
Allan Holtzmann
Learn Python Programming Masterclass
The course is well constructed and welcoming. It explains why they suggest doing things in particular ways, but does not restrict you if you have reason to do things another way. The challenges and code reviews are helpful to teach you what to do when you get your hands on someone else's code in the field.
Satish Vijayan
Java Programming Masterclass updated to Java 17
Good comprehensive Java course. I have a lot of development experience, but first time with Java. I was able to relate and apply in a short time span - 2 weeks.
Shan
Java Programming Masterclass updated to Java 17
His lectures are well structured. His lectures are in a proper sequence such that we understand everything and not cover a topic in a lecture that will be taught in detail in the following lectures. By doing this, we understand almost 100% of each lecture and can apply it in our coding journey.
Anand Jain
C Programming For Beginners - Master the C Language
I had an amazing experience through out the course. I have attended complete course and done all the exercises/challenges. This course is great for beginners as it lays foundation of programming. you may want to skip initial lectures but I would suggest to attend them at 2x speed as you may miss out very basic facts.The course covers all basics of C programming. The instructor is very responsive and always ready to analysis and debug your code. You must ask question in Q/A section even if you have silly doubt and don't want to google. JASON will answer them and suggest alternatives Kudos to JASON FEDIN for such course
Rishav kumar
Java Programming Masterclass updated to Java 17
The Best Java Course . Please take this course for complete understanding of java along with best practices and examples.
Simple and easy teaching , but also Tim Ensures he teaches the right coding practices so you can scale up your code
Shivam Saxena
Oracle Java Certification - Pass the Associate 1Z0-808 Exam.
This course has given me the confidence to sit for the Oracle Java certification. I would say it is the finest course I have seen for JAVA
Adina Schisler
Java Spring Tutorial Masterclass - Learn Spring Framework 5
JackPot! This seems to be the whole 9 yards on Spring including tools used within... clearly explained as it should be for people who take the course because they do not know it! THANK YOU! I find that very few instructors can remember how it was & what kind of help/information people need BEFORE they get to the level of knowledge they're at ...
Ann Voll
Beginning C++ Programming - From Beginner to Beyond
The course is remarkably thorough, expectations for each unit are set, then an explanation for content of each unit and then actual code is developed. The use of the IDE Codelite is super, the IDE is rich and easy to use. Thanks
Sudhanshu Tiwari
Data Structures and Algorithms: Deep Dive Using Java
Brilliant course to learn data structures and algorithms . The explanations are to the point and very clear . Lectures are engaging .
The exercises are fun to do and help us understand the topic better.
Looking forward to learn something new . Thank u Udemy for such an awesome course.
Arturo Ignacio Espinoza
Master MATLAB through Guided Problem Solving
So far this has been a great experience. I am a data scientist in training with an emphasis on neuroscience, so I know this is the right course for me. I am hoping I will be able to apply what I learn when I do data analysis.
Laura Morris
Master MATLAB through Guided Problem Solving
I was expecting some dry "how to" instructional videos but MXC goes above and beyond! Oh, how I wish my university professors were all like him. If you're thinking about taking a course from this instructor let me suggest the answer is "yes, Yes, YES!".
Roman Zeylikovich
Java Programming Masterclass updated to Java 17
This course is absolutely great. I read Herb Schildt's Java The complete reference along with this course and Tim's course is illustrated and structured very much like Herb's book and that makes it a pleasure to use. Very concise and clear.
Mike "Cloud Monk" Kreuzer, PhD, MCSE/MCT
Java Spring Tutorial Masterclass - Learn Spring Framework 5
Tim is such a great teacher — one of the best on Udemy. This class is no exception. Another clear, detailed presentation of Java and Spring Bootefulness. Thanks Tim for your hard work.
Buddha with you, Cloud Monk
Sina Jz
Android Java Masterclass - Become an App Developer
This course was a guiding light in my "Becoming a developer" path from the first step. It helped me become a much more educated developer comparing to my friend who learned to code from trial/error. It's still a guide for me. every now and then I will come back to this course to learn something new or to improve what I've learned somewhere else. A BIG Thanks to "Tim Buchalka" my Master.
Rodney Greene
Java Programming Masterclass updated to Java 17
This course is impressively detailed. I'm in my final year of college skipping around in this course as a refresher as well as using some of the later material to link in-class material to my programming skills. This is simply fantastic for people like me who get lost in the concepts.