You can't play soccer without rules.There are 5 important rules followed with other rules.The red card rule is when you get 2 yellow cards, or when you foul somebody on purpose.(Or at least the referee thinks you did it on purpose.)You can get yellow cards.For example, if you slide tackle somebody without touching the ball on accident, it is most likely you'll get a yellow card.If you get fouled between 18 or more feet, you'll get a free kick.If you'll get fouled between 18 feet or less, you'll get a penalty.