There are four spots from which fouls are administered. The preceding spot which is where the ball was snapped from . The succeeding spot which is where the ball will next be snapped and the spot of the foul and theend of the run. All fouls committed by the offense behind the basic spot which is the end of the run of on running plays and the previous spot for loose ball plays like legal forward passes and kicks are measured from the spot of the foul. For instance if ah offensive lineman holds one yard beyond the line of scrimmage on a pass playand the play advances the ball beyond that spot the foul will be measured from the spot of the foul. Penalty measurement also has many special rules for special situations but these are too complicated for this discussion.
Yes faceguarding is a penalty in college football
There is no penalty for that
There is no evidence that such a penalty exists in any football league currently.
Spearing is a fifteen yard penalty.
Football is a sport. It is played, not "applied".
It is considered a personal foul and is a 15 yard penalty. -Football official
This penalty is called "Clipping".
If you tackle in flag football it is a penalty.
Break the rules