Association football, like many other sports, has undergone many changes in tactics resulting in the generation and elimination of a variety of different positions. Goalkeeper is the only position that would have been around since the codification exercise. Even in the early days of organized football, when the system is limited or nonexistent, where the main idea is that all the players can attack and defend, a football team still has members appointed to play as a goalkeeper.
Initially, the goalie usually plays in between the goalposts and have limited mobility, except when trying to save a shot from an opponent. Throughout the year, the goalkeeper has grown, due to changes in the system to play, to have a more active role. The goalkeeper is the only player in football associations are allowed to use their hands to control the ball (in addition to the current throw-in). Laws of the Game of the original ball allowing the keeper to handle the ball in their half of the pitch. It was revised in 1912, restricts the use of arms by the goalkeeper in the penalty area.
There are examples of how to be a good goalkeeper