If there is not a basket in the back garden or one near by then find a wall then find a brick that is 10 feet off the wall and practice shooting at that.
If you can’t find a wall then shoot at a spot on the floor.
Use a variety of techniques before shooting such as spinning, bouncing the ball in front of you etc.
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.