Know the grounds for a red card

A red card can be given out before a yellow card if especially dangerous play is involved, although a red card usually results from two yellow cards. Reasons for red cards include
Kicking a player intentionally.
Jumping up at a player and making contact.
Charging a player in a rough way, especially if hands are involved.
Charging a player from behind.
Tripping a player.
Hitting, pushing, holding, or spitting at a player.
Handling the ball by a non goalie.