The "little box" in front of the goal mouth is the goal area. There is no rule governing the goalkeeper and the goal box except that if the keeper is taking a goal kick, the ball must be placed on or within the lines of the goal box to restart play. (Note that the keeper or any of his teammates may take the goal kick - there is no mandate that the keeper take the goal kick.) Following the taking of the goal kick, the ball is considered not to be in play until it crosses out of the associated penalty area, which is the "big box" inside which the defending goalkeeper my use his hands to play the ball according to the Laws of the Game. It is highly unlikely that these rules are modified in high school soccer. It could be fairly said that the sole purpose of the goal area is to define the area from inside which the ball is to be placed in the taking of a goal kick on that restart of play.
The goalkeeper for the soccer team, Chelsea is Petr Čech.
The club will determine how much any person in their employ is paid, and whether they will be paid separately for performing multiple duties. There is no regulation in soccer regarding this matter.
Yes the goalkeeper is counted as the substitute in football.
Nothing requires a goalkeeper to have a maximum weight.
simply a goalkeeper prevents the ball from going into the net
It has to be the goalkeeper.
GOALKEEPER you stupid