Mark G.

RULES OF FOOTBALL

First in football you got to know what they do to show that someone
did not follow a rule they throw a flag that means they did a penalty
if that does happen the team will move back yards back 5 yards  10,
15 and sometimes 20 and  maybe out of the game or you could say
there moving back.

These are some things that makes a penalty offside or you could call
it fullstart or pass interface punching kicking slamming and that is
how you get a concussion for insulting or hurting coach or ref short
for referee.