[Bill Baer]

Well the most common are the bracket racing classes they are pro (no delay boxes allowed) and super pro which is for faster cars and allows delay boxes . Both allow you to declare you own handicap (dial in) the object of which is to do a better job on the starting line (reaction time) and beat you opponent to the finish line without going faster than your dial in. Go under your dial in and you lose.
Super comp is similar to bracket racing but the handicap for everyone is 8.90 the object of which is to do a better job on the starting line (reaction time) and beat you opponent to the finish line without going faster than 8.90.Go under 8.90 and you lose.
Most super comp racers have a timed throttle stop to slow the car down to 8.90.
I would suggest that after you have some laps under your belt and you get your competition drivers license that you try super pro at one of your local tracks. But be for warned most super pro racers are experienced and tough to Beat.

But not unlike baseball "it's the fact that it's hard that makes it great"!