2 teams, one has the ball first and tries to score- if they can't they may go for a field goal, if they can't do that they punt the ball to the other team and that team tries to score. It's great fun; there are more factors than that- watch and learn more:)
Basically 1 team is trying to run the ball to the other end of the field. They have four chances to move the ball 10 yards by either throwing or handing off the ball. If they can't do that or the other team catches the ball the other team gets the ball. A touchdown is when one team reaches the end of the field 6 points. After a touchdown the team that scored gets to kick the ball and try and get it through those two poles in the end zones 1 more point. They could also try and run into the end zone again instead of kicking. 2 more points. If a team is on their fourth try to run the ball they can kick between the two poles for a field goal 3 points. Last thing is the penalties which are very confusing just try to figure them out yourself.