Making the transition from hard courts to clay courts can be a challenge. Here are a few simple rules to help you succeed quickly on clay.
You must get a high percentage of first serves in. Second serves are much easier to take advantage of on this slower surface. Use more of a kick serve or a slice to help your percentage. See previous tips Kick(serve) some Butt!/Kick(serve) some Butt(2)!/
Always hit behind your opponent in a ground stroke rally. In other words, don't hit to the open court unless you can hit a winner. Also hit higher over the net with topspin for consistency. See tips Hit "de fence", stay on offense/One more ball
Lastly, once you have control of a point and can hit a winning volley, make sure you move forward through the shot. On clay, the ball doesn't penetrate like it does on a hard court, so it's important to keep you body weight going forward to add power to the shot.