Can some American explain to me the rules of American football? An example of how a game works out? There is some American football on British telly and i'm tempted to watch it.
I have zilch knowledge on the game.
Sure, American football is much more straightforward than baseball
The game lasts 60 minutes divided up into 4 quarters of 15 minutes. After each quarter, the teams switch positions on the field to even out unfair weather advantages. Throwing or kicking into the wind is considered the main one.
The 2nd and 4th quarters are special in that they get a mandatory time out at the 2:00 mark. This creates extra tension by extending scoring drives at the end of the 1st half and the end of the 2nd half of the game. Between the 2nd and 3rd quarters is Half Time when everyone takes a 15 minutes break.
Basically, whichever team has the most points after 4 quarters is declared the winner. If there is a tie, then the game goes into overtime and the first team who scores is declared the winner. (In pro football anyway, college is a bit different)
At the start of the game, a coin is flipped where the visitors calls heads or tails in the air. Whoever wins the coin toss decides if they want to recieve the ball 1st or kick it off to the other team. If the coin toss winner decides they want the ball first, then the other team will start with the ball in the 3rd quarter. If they decide to kick it to the other team, they will get it at the start of the 3rd quarter.
So the coin toss isn't really a big deal at the start of the game. It IS a big deal in overtime though.

Can't recall anyone who won the coin toss in overtime and decided to kick it to the other team.
So one side lines up to kick the ball while the other side lines up to recieve it. The kicker has two options during
a kickoff.
They can kick it as far as possible or attempt an onside kick. An on-side kick means that if the kicker can kick the ball and it goes more than 10 yards, then his own team can pick it up and the ball is theirs! If his own team touches the ball before it goes 10 yards, the other team gets the ball at that spot. (Which is practically midfield)
So onside kicks are
very dangerous. Kick it too hard and the other team will get it at the 40 yard line almost at midfield or kick it too soft and they get it midfield. Kick it too slow and the other team will run forward and scoop it up! Most teams only attempt it when they are sure the other team isn't paying attention or if they are down by a lot of points and need to catch a lucky break.
The receivers goal is to catch the ball and run it back for a touchdown if no one tackles him. If the receiving team touches the ball and the kicking team scoops it up, then it is theirs. So you want a guy who can catch the ball and run really fast receiving kickoffs.
If the kickoff goes into the end zone, the receiver might see the kicking team bearing down on him and take a knee. That is called a touchback and the receiving team starts at their own 20 yard line without anyone having to get tackled. If the kicker is feeling very strong or has the wind at his back, he can kick it across the whole field, across the end zone, and beyond the endzone, which is an automatic touchback.
If the kicker lands it out of bounds to the left or right, the other team can take it on their own 35 yard line, or ask for a rekick 5 yards farther back than the 1st, or take it where it bounced out.
Every time a team scores a field goal or touchdown, they have to have a kickoff to the other team afterwards. The only exception to this is a touchback where the quarterback/running back is sacked in his own endzone. The other team gets 2 points for this AND they get to receive a kicked ball.
So, at the start of the 1st quarter you will see a kickoff. The guy will usually catch it and try to run it past his own 20 yard line at least and maybe more if he gets good blocks. If he gets really good blocks then he could even run it back for a touchdown. The kickoff used to be from the 30 yard line, but a bunch of girls voted to move it to the 35 yard line, so now kickoffs are usually deep into the other team's endzone these days and you see many more fair catches and bloodless 20 yardline starts.
If one team manages to get the ball into the other's end zone, that is called a touchdown and gets 6 points. After that, the team gets to kick the free point which is like a very very short field goal. It counts as 1 point. No pro kicker ever misses those. (Usually) The team could also attempt to run or pass it 5 yards into the endzone again for 2 points, but it fails over half the time so coaches usually go for the 1 point.
A team can also attempt a field goal if they are close enough and they don't think they can score a touchdown. It is worth 3 points. If the ball misses, then the other team takes possession from the other team at that spot. So not only are farther away kicks more difficult to achieve, but failure lets the other team start much closer in a position to score themselves. If neither a touchdown or field goal looks possible, then a team will punt the ball. A guy kicks it much like a kickoff, only the ball is usually in the air much longer and doesn't go as far.
A punt is just like a kickoff, only when the kicking team touches the ball 1st, it is downed there for the other team. The kicking team doesn't get a chance to take possession of it like during a kickoff unless the other team touched it first. A punt can also bounce out of bounds and the recieving team has to take it there. It is a rare punter who can bounce it out of bounds at the other team's one yard line on purpose. A very very high kick that lands on the other team's 5 yard line where the punter's teammates can touch it is also valuable.
So offense and defense. Maybe someone else can explain this part I'm tired

The offense gets 4 attempts to advance 10 yards.