go straight up, come straight down
GO STRAIGHT UP, COME STRAIGHT DOWN
As you come off the catch, or pull up for a shot off the dribble, your momentum can carry you forward, backward, or to the sides. Use your feet to re-gain balance, by planting your toes and raising your heels up.
As you go up for the shot, go straight up, perpendicular to the floor, and land down and forward, so you don't fire your shot too much to the left or right, or too short or long.