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