Spin is generated depending on where you tap the golf ball when you hit it. Tapping the center will not add spin, however other locations will. Changing the ball's carry will vary the starting distance that it travels. Changing the ball's run will alter the distance it moves after the first bounce. Use spin to maneuver around obstacles. You can also combine them by tapping in the diagonal locations on the ball.

Backspin: Tap the bottom. This increases carry, but decreases run.
Sidespin: Tap the left for a fade or the right for a draw. This carries your ball more in the corresponding direction.
Topspin: Tap the top. This decreases carry, but increases run.