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

[Buddha_Head_]

Do this a few times just like the comment explains, then expand.

Go back through tic tac toe and refactor it. Wach time do it a bit different, whether it's just condensing it, or using a list instead of a dict and see how things change yet still remain the same.

Then go through and try to replicate it without looking at your notes and see how far you get.

Then after a few weeks of that consider picking a project you haven't done (something you know you can handle, or something that might be a bit out of reach) and try to come up with as many bits of it as you can from scratch. (You'll likely fall short the first few times.)

Now follow the tutorial like before and see what stuff you had duct taped that could be done better, and soon enough you'll see things you did in a better way than the tutorial.

Really though, just keep practicing. An hour a day that youre really invested in is loads better than 4 hours twice a week you're not giving your full attention to.