The basic strategy on a hard court is related to the speed of the surface. The slower the hard court is, the more you follow clay court strategy. If the court is fast, the points last fewer shots. The chances of exploiting an opponent’s weakness are therefore less on a hard court. It’s also harder to hit passing shots, because the ball gets to you so much faster.
Grass courts are hard and resilient making the ball bounce far and skid low. Since the ball reaches you faster, shorter preparation is required. Use slice and flat strokes to make the ball stay low. Grass is unpredictable, so, your emphasis is on getting to the net volleying. Introduce your attacking game at every opportunity. Since the surface does not allow the opponent much time to prepare, net players have an advantage.