Kick-off is a place-kick made from the center of the field. The kick- off cannot score a goal. The
Kick-out, when one of the players on the side which has touched the ball down in its own goal makes a punt, drop-kick or place-kick. A
Free-kick, any kick where the rules forbid the opponents from advancing beyond a certain point.
In-touch is out of bounds.
A Touch-down is when the ball is kicked or carried across the goal line and held there.
A Touch-back is when the player touches the ball to the ground behind his own goal, the ball having been propelled over the line by an opponent.
A Safety Touch-down is when either by a kick, pass, or a snap-back, the player guarding his goal receives the ball from one of his own side and touches it down behind his goal line, or when he carries the ball across his own goal line and touches it down, or when he puts the ball in his own touch-in-goal, or if the ball, being kicked by one of his own side, bounds back from an enemy across the goal line and the player guarding the goal then touches it down.
SOME RULES
When a kicked ball is caught on the fly by one of the opposite side, the catcher marks with his heel on the ground the spot where the catch was made. The catcher then shouts, "Fair Catch," or he may hold up one hand.
Beyond the heel mark the opponents of the catcher cannot advance till the ball is again put in play. The catcher is entitled to the privilege of falling back towards his own goal, as far as he chooses; from the point selected he may take a place-kick, a drop-kick, or a punt. Instead of this, he may choose to give the ball to one of his own side for a "scrimmage." The scrimmage is governed by special rules.