How to Do the Ollie on a Skateboard
Push off with your rear foot to get momentum. Place your front foot near the front bolts of the board and your rear foot at the tail's tip.
Bend your knees and push down with your back foot on the tail of the board until it is almost vertical.
With both feet on the board, jump up, and bring your knees towards your chest. At the same time, lift your arms out to your sides above shoulder height.
Move your front foot to the nose of the board, until the board is parallel with the ground.
Keep your knees bent to absorb the landing.