Best not to look too closely, you will pick up bad habits.
These are experiments, often in some state of flux. I might try something that I am thinking of doing a talk about, or do some "scratchpad" work while doing a course. Or I'm just high on sugar and crafting bugs. Anything goes.
Also, quite a lot of this is part of me mentoring and/or teaching someone something. I find that making people pull code from Git helps them learn some basic skills in the process.
So... Rather do not run any of this stuff on your computer!
Some of the code here is not meant to compile or run, because I was testing something specific and needed to create a scenario. So don't be alarmed if there are errors, it might be intentional. Only, you'll never know now, will you?
Seriously. Especially not on a mobile device. Terrible Idea.