Fault
It is called a 'Let'
Do you mean "let"? If so, a let is when a serve touches/nicks the net AND lands in on a player's serve. People call "let" so the server knows their serve hit the net. If a server hits a let, they get to redo their serve.
I am not sure but just call your local tennis place
No, you CANT step over the serving line when you serve in volleyball. The "ref" on the side of the court, on the stand, will call it, and give a point to the opposing team. Usually the line judge should call it....
Let is when the ball goes over the net and lands inside the box but hits the net going over, Let is only on a serve. Net is when the ball hits the net and fails to go get over the net.
The main joints used in a tennis serve are the shoulder, elbow, and wrist. The shoulder generates the power and range of motion needed, the elbow helps in extending the arm for acceleration, and the wrist provides flexibility and control over the racquet. Coordination among these joints is crucial for a powerful and accurate serve.
Of course! As long as it doesn't hit the net and then go over, it's fine.
You can hit an underhand serve in tennis; however, the overhand serve is more effective because it is more powerful. That is why you don't see the underhand serve used much.
a serve
Badly.
A tennis ball!