The two most important things about an ollie is the foot placment and the toe drag. your feet can't be to far apart or to close, If your feet are to far you won't get the height. If they are to close...well then....you won't be able too. So whatcha wanna do after snapping back on the tail of the board, is to drag your toe on the board.(only ollie with shoes on) If you don't drag your toe right, then you won't get the wheels off the ground. So you literally have to have your front foot toes touching the board. And when I say drag your toes I mean have like your toenails touching the board, and then drag. So trust me, I have fallin countless times trying to do an ollie, but that's all part of skateboarding. And if you do it right, I promise the board will come off the ground. So if I didn't do a great job please leave comments on what you think I should improve. Good luck guys!