Adui, the single thing that I most appreciate from all the things my instructor taught me was the way to think about the plane when it's coming towards you. It was so simple yet so powerful that it provided all the confidence I needed to improve my overall flying skills. He said "When the plane is coming towards you and it's not flying level, push the aileron stick towards the side of the plane that is dropping". I know it sound obvious but as soon as I got that burnt into my brain, it became a natural instinct and nowadays I don't even notice if the plane is coming or going in terms of the corrections I need to make to the plane's roll attitude. Another thing that was taught to me that has proven to be worth is weight in gold (if such thing is possible) is not to learn systematic routines for certain situations, but to be able to look at the plane and understand the inputs it needs to get it to fly like you want it. For example, instead of thinking "When I'm banking and the plane turns around, I have to give opposite stick input to get it into level" you should be able to watch the plane and understand which input it needs regardless of the previous things you did.

I hope I was clear enough