Wheelie means lifting the front wheel from the ground and riding the bike only on the support of the back is known as Wheelie. This is done by either by power of by clutching. There you can watch basic to extra ordinary wheelie videos.
Stoppie means lifting the back wheel of the bike from the ground by instant braking and momentum of the bike. This style is also known as Endo. Watch the top class stoppie videos too here. Burnout means creating smoke and fire from the rear wheel's tyre by speeding by the engine, by which the tyre rubs the road, which in turn creates smoke and fire. Bike will not be in motion, only the rear tyre will be rotating.