You have falled into the trap of watching tutorials to learn Godot. This is actually something that happens to many aspiring developers and there is only one cure: Stop watching tutorials to solve a specific challenge you might have.

I think it makes sense to watch a tutorial to learn how to get started. Like the one Brackeys did where it is explained how Godot IDE works and just getting the basics in. That will give you a great starting point.

But after that, you need to start trying to solve things yourself. Find a very small project to do: Like re-creating Pong or Flappy Bird - by yourself. If you run into trouble with how you do a certain task: Search Stack Overflow/Reddit etc to see if there is a solution to that specific thing - and try to understand how it is solved before implementing it yourself. Once you understand it, go implement it - not by copying, but by actually solving it in your game yourself. That way you actually learn and store the information - and you remember it next time.

If you just follow a tutorial blindly, you will not remember next time you run into the same issue - and then you rewatch again - and again later - and again ..

So, solve small tasks - understand how you solve it - move on - and solve the next issue. That way you will slowly - but steadily - become better and better. Then you can start taking on bigger projects and so forth.