• A serve may touch the net on it way to the service court before landing. This is not a let or a do-over.
Rule 4.A.6.

• A player may not touch any part of the net system or the opponent's court, or the opponent while the ball is still in play.
Rule 11.I.

• After striking the ball, a player or anything the player is/was wearing or carrying may cross the net.
Rule 11.I.

• If a player hits the ball over the net into the opponent's court, and then the ball bounces back over the net without being touched by the opponent, the striking player wins the rally.
Rule 11.L.4.

• In the above situation, a player may reach over the net, under the net, or around the net post, to return the ball with a volley or groundstroke.
Rule 11.I.1.

• For net systems with a horizontal bar that includes a center base: If the ball hits the horizontal bar or the center base before going over the net, it is a fault.
Rule 11.L.5.a.

• Other than on the serve, if the ball goes over the net and hits the center base or any part of the horizontal bar or the ball gets caught between the net and the horizontal bar before, or after, touching the court, it is a let and will be replayed.
Rule 11.L.5.b.
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• There is no limit to the number of lets a server may serve.
Rule 4.0