yes.
In singles...the ball hit inside of the side double lines. In doubles...the ball hit outside of the side double lines.
The opposition get a point for a double fault
It is not illegal to hit a boy but it is illegal to hit a girl.
A tennis ball
A tennis ball?!
A tennis raquet is bigger, and stronger too as it has to hit tennis balls not shuttlecock.
Yes, the weight. The lighter the tennis racket, the lighter you hit the ball. The heavier racket can hit harder shots.
It depends on how hard you want to hit the ball
No, as long as your feet don't cross the baseline, your fine. *Note- do not catch the ball with your racket if you decide not to hit your toss. If it touches the racket, it counts as a serve.
When the same person hits the ball twice in a row, it is called a double hit.
When you hit a tennis ball with a tennis racquet, you want the ball to contact the sweet spot of strings.