I’d say for a truly proper text book slappy of any kind
-don’t ride up with your foot on the nose or tail unless it’s a crooked grind, you can tuck your foot into the pocket of the tail or nose for almost every other grind
-wait until both trucks make contact with the curb to go into most other grinds (smith,5-0 etc)
-don’t throw your arms up to lift your weight on the way in, carve it and suck your knees up to your stomach right before impact with the curb