*Something many coaches say is that a forehand swing is like "skipping stones." You should be able to see this if you watch how his elbow leads his swing, but then is relatively stationary as he whips his hand/racket.
*You can choose to use the right foot in the forehand front. You can also choose to use the left foot on the backhand in the backcourt, though this is more advanced.
*In this video, we see Shahier using a lob serve. These are difficult to pull off, but they are very effective.