Football loses the yellow flag

Football rules
Football is also called American football. The following are the detailed rules of football. The field and players of American football are usually nicknamed. In case of a foul in the game, the referee will throw a small yellow flag near the place of the foul. After the game stopped, there was no foulWhy does NFL American football throw a yellow handkerchief on the ground every time it judges_ Hundred
For example, packers V patriots, when packers attacked their offensive tack to block the opponent's line back, the referee threw a flag and waited for the attack to "down" (generally, offensive or defensive fouls are not settled until the ball lands), the referee and several other refereesThe rules of American football
The standard American football game is divided into four sections, each of which is 15 minutes. The second section is called the first half and the fourth section is called the second half. There is a 12 minute (20 minutes in the college game) half-time break between the first half and the second half. At the beginning of the second half, the ball will kick off again as at the beginning of the gameHow to understand the offside rule in American football
The black line is added by live real-time computer special effects, which is the kick-off line. If the defender in the white shirt on the left exceeds this line, the attacker will drive the ball out before he returns to the line (as long as he leaves the ground), and the defender will be fined offside foul. Offside will not be punished immediately, and the referee will throw a yellow flagAmerican football problem
Please introduce the rules of American football in detail, and then send a picture of the standard field. I don't know anything about football, so people who understand it better cooperate with the picture (for example, tell me what a certain area is used for) thank youThe rules of American professional football
The standard American football game is divided into four sections, each of which is 15 minutes. The second section is called the first half and the fourth section is called the second half. There is a 12 minute (20 minutes in the college game) half-time break between the first half and the second half. At the beginning of the second half, the ball will kick off again as at the beginning of the gameFootball rules
American football or American football is derived from English football and is a kind of football. In the middle of the nineteenthcentury, a game similar to football was often held in the east of the United States. Players scored as long as they kicked the ball across the opponent's scoring line. There are as many as 30 players in the team, sometimes more. Because this kind of American football was originally only allowed to be kicked with the footThe rules of football (tried in America)
American football matches are played between two teams with a maximum of 53 players (NFL rules). Both sides send 11 players to play, and can change some or all of the players at any time. The one who gets the ball control is the attacker. The goal is to push the ball to the opponent's position as far as possible and try to cross the scoring line and enter the opponent's end zone to scoreThe rules of American football
The basic rules of American football in ball games, the rules of American football are more complex. But that doesn't mean you have to read an obscure rulebook to read football. In fact, it only takes you five minutes to understand the football game. Of course, if you want to understand it deeply, it is another matterThe rules of American football
The goal of American football is to push Rugby into the opponent's touchdown area. At the same time, more points are obtained than the opponent within the specified time of the game