Stand with your legs spread apart; drop the ball in front of you. Now hit it with your right hand and then your left hand, then reach behind you and hit it with your right hand then left hand, then reach in front of you again and hit with your right hand then left hand, and then behind you again...
Rebounding is the least glamorous thing in basketball and one of the most decisive. It is also almost entirely a habit, which means it is entirely coachable.
Good spacing is only the start. The best modern offences teach players to attack the defence's rotations and play in a permanent 4-on-3 - here is how to coach that read.
The ball screen produces almost half of all professional offensive possessions, yet most teams still teach it as a memorised play. The modern approach trains the read - giving players a framework to decide based on what the defence does, not what the coach called.