If the ball hits the net and goes over during a serve, it is called a let and is not counted as a fault. If it doesn't go over it is counted as a fault. In play, if the ball touches the net but goes over it is counted and a point is given to the player who hit it; if a ball hits the net but it doesn't make it over, a point is given to the receiving player.
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the ball can hit the net whenever, but it isn't nessicarily very good because when you hit the ball it is then hard to return