The player with the ball (move the player back if too easy to hit over the net or move this player forward if it is too difficult for this player to hit the ball over the net) hits the ball over the net.
Each side can contact the ball a maximum of three times per side before the ball must go over the net.
No player may strike the ball two times in a row.
If the ball hits the floor the other team scores a point and gets the service.
If the ball lands outsider the court that side scores a point and gets the service.

Net

Great Book