Good basic techniques are at the core of better riding, for beginners and world champions alike. I work on them often. One key basic is riding the edges of the board.
Start by carving inside the wake like a surfer. This drill will have you switching back and forth quickly from heel side to toe side. Do these same surf moves outside each side of the wake. Going from heel to toe side edge is done by keeping your upper body level and balanced while working your feet and legs by applying more pressure on either the front or back of your feet.