With arms outstretched wait for the ball to come to your hands. As the ball reaches your hands, cushion the momentum by moving your hands to your chest. This will act to shield the ball as well and set you up for making a pass or moving the ball in the direction that you require.
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.