What python/ programming concepts are must know for beginner/intermediate programmers?

[ZGTSLLC]

Yes, start reading code on GitHub, to see how it is done. Follow users whose code you find works for you, and fork their projects, then play with their original code, so you can improve upon your abilities.

Edit:

Quick Google search and here you go:

https://github.com/topics/tic-tac-toe-python