Getting a good positional understanding is an important step to improving your play and becoming a stronger player. Studying the basic themes, seeing the positional masterpieces played by the great players and solving many exercises can help you in this direction. One of the most important concepts, which appears in probably every single game is weaknesses and understanding how to identify and use them in your advantage. Not only this, but you have to also try to create as little as possible in your position and know how to get rid of them if you have any.