This is a standard 2-3 defense patern and how to actack it. The green areas represent the weak points of the zone, while the yellow are the strong. The ball begins at the top with the point guard and is passed out to either of the wing players. This has the effect of moving the 2-3 defense. When the ball is passed to the wing if the route is clear then take the 3 point shot.
Four players standing still make every ball handler's job harder. Teach V-cuts, L-cuts and back cuts so your team gets open and punishes defenders who overplay.
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.