Part 2 of the series is now up. As the title says, I'll show you how to change a scene through code, how to create your custom scene and how to create a custom window. As a bonus, in the video there's shown how you can map custom keys.
Required: An IDE (some of the most popular ones are Atom, Sublime text 2, Visual Studio Code (which I use) or Eclipse), some Javascript knowledge, Object oriented programming might be of help.