Freestyle

 Freestyle is what Rodney Mullen does.  It's flip tricks combined with caspers, primos, rail stalls, truck stands, pogos, all of that.

Casper:  When your riding, set up like a klickflip.  Kick down on your front foot with or without popping your back foot.  This should flip the board.  Catch the board upside-down with your front foot and pull up.  You should be in a casper position.

Casper 180 Flip:  For this, just ride casper and flip the board by lifting up your front foot and pushing your back foot back.  It's all about getting the right rotation.

Casper 350 & 540 Flip: Just like a casper 180 flip but you kick as hard as you can.  When you're first learning this just put your feet down randomly, then work on the timing.

Rail Stall: Stand with your feet over the trucks.  Put forward with yourtoes and jump up.  Step on your wheels.  You should be in a rail stall.  Kick the board back and land it.