First, watching youtube is great for learning things.

A possibly different perspective. Do things, don't study. Only study if and up to the minimum that you need to accomplish the thing you are doing right now.

I don't study. I don't worry about it. I just learn things I either am passionate about so can't help but study or for my work (including personal work); the thing I need to learn to accomplish my immediate task.

I guess I'm saying don't bother learning things you aren't passionate about or you don't need right now.

And only study the thing you most need right now (makes it easy to know what to study next).