Classically Unclassical

https://lichess.org  is a great site, not only because it is free, but because it abstracts the entire process of online chess in a simple and easily digestible manor. Lichess also features a machine learning opponent that adapts and improves after every game. This site holds many applications in AI as well as network programming. The raw source code can be found here:  https://github.com/ornicar/lila 

https://github.com  has become the premier center for software development around the world. Almost all major languages, packages, and cyrptocurrencies can be found on this site, including source code and major contributors. If you've thought of accelerating your software development skills and find out how to get so many people to work on one program all at once in an effective manor, github is the place to be.

If you haven't heard of this website by now, boy are you in for a treat ( https://stackoverflow.com ). Stack Overflow is great, not only for its amazingly robust community, but for its ingenious way of not allowing reiterated questions to flourish, thus forcing everyone to one board so that all debate can be centralized. I would recommend Stack Overflow to anyone and everyone who has ever written even a single line of code.

The website of this post ( https://docs.python.org/3/ ), is a very good website. Anytime I don't understand anything about python, which is almost all the time, this website will always have an answer or explanation as to how certain modules or functions work. It is fast, nimble, and concise, and that's why I would recommend this site to any and all attempting to learn python.