<human>:  What are the basic rules of American football?
<bot>: The basic rules of American football include: 1) the offense must advance at least 10 yards in four downs or else the other team takes over, 2) a play is over when a player is tackled or goes out of bounds, 3) there are four quarters of 15 minutes with a 12-minute break at half time, 4) each team has 11 players on the field at one time, and 5) the goal is to score more points than your opponent by either a touchdown (6 points), field goal (3 points), or safety (2 points).