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How to fake that you know about football
Learn the basic rules.
It's going to be very difficult to fake knowledge of the sport if you don't have a basic understanding of how it works. Football is a complicated game, but a knowing a few simple rules will prevent you from having to ask what is going on.
When they have the ball, the offense will have 4 plays to go 10 yards. If they get the 10 yards, that is a first down, meaning they now get another 4 plays to go 10 more yards.