It can mean many things:
Gain space.
Improve the activity of your pieces.
Eliminate/Minimize weaknesses.
Create weakness(es) in the opponents position.
"Improve the position"?
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This might help to explain what is meant by "improve the position"...
Good Positional Chess, Planning & Strategy Books for Beginners and Beyond...
https://www.chess.com/blog/RussBell/introduction-to-positional-chess-planning-strategy
What does it mean to "improve the position". What is a good position?