Yes, and it's a turnover.
If you pass the free throw line when shooting you will be called for a line violation.
No, not that I ever heard of. It maybe if you are talking to the free throw shooter.
its when you step in the middle of the free throw line
The player that gets the rebound, offense or defense.
the opponent has two free throw shots and has a chance to score twice
Out. If you step on the line you are out of bounds (perimeter boundaries). On the line on a free throw, you are in violation.
three seconds. Three in the key.
when you stand behind the free throw line WITH the ball for 5 secs or more.