You are right. But I still find the ‘heavier’ theory, that is what I assumed OP refered to, to be more difficult to grasp then following a basic tutorial and just trying to solve problems. In time with practice you get a better understanding for WHY the theory is how it is, and you can apply it better and of course improve your code. And that understanding will unlock more tools both in OOP and in your mind.

So if you are struggling, I recommend not starting with theory.

Use it for a while, to complement your theoretical study. Things will only become clearer when you have your own understanding and opinion about it.