A touchdown in American football is scored when a player carries the ball into the opponent's end zone or catches the ball while in the opponent's end zone. A touchdown is worth six points. After scoring a touchdown, the team has the option to attempt an extra point (worth one point) by kicking the ball through the goalposts or a two-point conversion by running or passing the ball into the end zone again.

An American football game consists of four quarters, each lasting 15 minutes, for a total of 60 minutes of play. There is a 12-minute halftime break between the second and third quarters. In case of a tie at the end of regulation time, an overtime period is played. The length and rules of overtime can vary, but in the NFL, it is a 10-minute period in which the first team to score a touchdown wins, or if the period ends without a touchdown, the game can end in a tie during the regular season.

A first down in American football is achieved when the offensive team advances the ball at least 10 yards from the line of scrimmage. The team is given four downs (or plays) to gain these 10 yards. If they succeed, they are awarded a new set of four downs to continue their drive towards the end zone. If they fail to gain 10 yards after four downs, the opposing team takes possession of the ball.

The basic positions in American football are divided into offense, defense, and special teams. On offense, key positions include the quarterback (who leads the offense), running backs (who carry the ball), wide receivers (who catch passes), and offensive linemen (who block). On defense, key positions include defensive linemen (who rush the passer and stop the run), linebackers (who tackle and cover), and defensive backs (who defend against passes). Special teams include the kicker, punter, and return specialists, among others.

The legality of betting on American football games varies by state and country. In the United States, sports betting has become legal in many states following a 2018 Supreme Court decision that allowed states to regulate sports betting. Many states have since established legal and regulated sports betting markets. It's important to check the specific laws and regulations regarding sports betting in your area before placing any bets. Always gamble responsibly and be aware of the risks associated with gambling.