How do you serve a fault in tennis?

Fault (in tennis) describes a invalid serve. It is a fault if the serve fails to land in the receiver's service court; if the serve is made beyond the baseline or the wrong side of the center mark on the court. It also applies if the server misses the ball completely on a serve.

There is also Double fault which is two failed attempts in which the opponent receives the point.

And last there is a Foot Fault which is when the severs foot enters the court before the ball contacts the racket. It also applies if the servers foot is on the wrong side of the center mark or the server is running or walking during the serve.