Dreaming of beating someone is a sign of conflict as per dream interpretation and meaning. You need to be careful while dealing with people. Avoid getting angry and try to see a bigger picture not narrow down just to the present moment.
Dream of beating someone you know means you will be cheated or you might be wronged. The dream means you will face problems in your relationships.
Dreaming of beating strangers means incidents in a public place that might bring shame or legal problems. The dream is a kind of warning and asking you to avoid any situation that involves confrontation.
Dreaming of beating someone and you are happy or all smiling means you will get opportunity to defeat your enemies. You will overcome competition. Revenge will be taken by you.