When I was a kid, I got into a lot of fights at school because I lived in a small poor violent ghetto town where there wasn't much to do. A lot of kids there were poor, and from uneducated families, and they would try to pick on me because of the way that I dressed and spoke. I had a hot temper and I would fight.
One day, I got suspended from school and my dad came to pick me up. My dad told me never to fight at school, especially in front of teachers. He said even if someone hits me, take it like a man. He told me to wait until I encounter the person alone, preferably outside of school and don't give them a moment's notice.
He also told me to fight dirty if the person was much bigger than me, e.g., pick up a weapon, throw dirt in their eyes. He said if the person was smaller than me, I should grab them and slam them, and keep them on the ground until they give up.