Yellow as a warning, red to be sent off.
There is no set limit but the referee will eventually step in and start cautioning for misconduct, which would eventually result in a send off.
A 13 year old may be a soccer referee.
Cards are shown for misconduct. Misconduct may or may not be a foul.
Yes, you can. The referee's authority extends until he has left the field and the immediate environment of the field. They will show a card in this instance. Even then after that, the referee may include information in his report that the league authorities may act on just as if it were misconduct. e.g. confronting a referee in the parking lot. The referee just wouldn't bother showing a card.
Cards are only shown for misconduct. A foul can also be misconduct, but does not have to be.
A soccer referee signals the end of a game by blowing the whistle 3 times.
A foul is a term used to describe an infraction punishable by a direct free kick. There are 10 such infractions. A foul can happen without misconduct. "Player X pushed player Y. Direct free kick." A foul can also be misconduct. "Player X performed a reckless slide tackle. Caution + direct free kick." There can be misconduct without a foul. "Player X persistently dissented the referee's decisions. Caution awarded the next time the ball is out of play."
like what soccer license if you mean as referee then yes
An assistant referee is an official in soccer, previously known as a linesman, whose job it is to assist the referee.