You need to have this skill in the bag if you want to do a whole load of the more advance moves.
The Ollie is the best way to get some air without the aid of curbs, steps or ramps.
Practice with the scooter stationary to start with. Then as you get more height try it moving.
Position your feet with your back foot near the back of the deck. The front foot near the head of the scooter and angled forward.
Raise the back foot heel, with you weight centered on the ball and toes.
Push down with your back foot heel, and immediately jump up. Lead with your back foot followed by your front foot after sliding it right to the front of the deck and pull the handlebars
Bend you legs when you are in the air and relax your arms.