The position of football includes: center, striker, winger, front waist, avant-garde, back waist, goalkeeper and so on. 1, centered. Center, also known as CF, is a kind of striker, the sharp knife and the main scorer of the whole team. The range of activities is mainly near the opponent's restricted area in the frontcourt. He is the person closest to the opponent's goal on the football field. Scoring is the main duty of the center. They don't need to have good breakthrough and passing skills, and the overall situation is almost irrelevant, but they must have a keen sense of smell in front of the door and feel better about shooting. 2. Double forwards. Also known as shadow striker, the position is behind the center. When attacking, follow closely behind the striker or run without the ball on one side. Once the striker is shoveled or blocked successfully, he must protect the ball or distribute it to an unmanned position. At this time, the shadow striker will immediately break through with the ball and create scoring opportunities. 3. Unger. The winger is also a kind of striker, whose main activity area is in the front two wings. The winger should not only be responsible for attacking from the flank. Moreover, it is necessary to complete a variety of tactical tasks through interleaving and transposition. The winger's biggest advantage is speed, and only extremely fast speed can help the winger break through easily on both wings. Of course, a certain ability to cross is also the winger's housekeeping skill. 4. Front waist. Front waist, a kind of midfield position, is also called "sudden avant-garde" The standard station is located behind the striker and is responsible for delivering offensive shells for the striker and organizing the second attack. The candidates in the front waist need to have good ball control skills, broad vision and excellent sense of the overall situation, so many players in the front waist wear 10 jerseys, which is the core of the team's midfield and even the soul figure. 5. Goalkeeper. The goalkeeper, also called GK, is a goalkeeper. Goalkeepers can save the ball by touching it with their hands in their own restricted area. Height and arm length are one of the obvious characteristics of most goalkeepers, so they have an absolute advantage in the face of high-altitude balls. Today's goalkeepers are playing an increasingly important role in the team's tactical system, and this demand to ease the pressure in the backcourt has also spawned a number of goalkeepers who are not inferior to strikers. There should be two teams participating in a game, and each team should have no more than 1 1 players, including a goalkeeper. Any team with less than 7 players can't start the game. In official competitions sponsored by FIFA, the Intercontinental Federation or the National Association, a maximum of 3 substitutes can be used in each competition. The rules of the competition should specify how many substitutes can be nominated, from 3 to no more than 7. In other competitions, substitutes can be used according to the following provisions: the relevant teams agree on the maximum number of substitutes; Notify the referee before the game; If the referee is not informed before the start of the game or the teams have not reached any agreement, the number of substitutes can not exceed 3.