Simply set up facing a wall with one ball. The player will bounce the ball before passing it towards the wall.
On return of the ball, the player will bounce it with the other hand before passing with that hand, with the ball returning back to the previous hand, and this is repeated.
Good team defence is five players guarding the ball, not five separate one-on-ones. The shell drill is where that starts, so here is how to teach help-side positioning and rotations from the first week of the season.
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.