This is not about how to serve or return of serve, but all the shots you will master to become a better player.
Offensive shots are shots which will end the rally.
Down the line passing shot is the #1 offensive shot in racquetball.
Cross court passing shot is the #2 offensive shot in racquetball.
(Note. This is why you can't block cross court and down the line pass because they are the best offensive shots in racquetball.)
Defensive shots are shots which are not need to returned low to the front wall.
Ceiling ball is the #1 defensive shot in racquetball.
Z-ball is the #2 defensive shot in racquetball