Where do you go to learn more advanced concepts

Hello everyone,

I was curious where is your goto place to learn some more advanced concepts or learn something more than just the basic tutorials of like chat rooms or todo lists etc.

I would say I am currently at the intermediate level of programming, and I know how to do all of those basic apps, and I know some advanced concepts. I want to be able to read or watch how people solve more advanced problems that require some more thought than the basic apps I see all over youtube.

Any youtube channels or company articles you always look out for? Any more specific websites dedicated to more advanced concepts?