Combat refers to the systems used in roleplaying games to resolve conflict through violent means, often to the death of one or more characters. Combat often involves several subsystems that determine whether harm is inflicted (to-hit) and the extent of that harm (damage).
I don't understand what dice I'm supposed to roll or anything. Do I roll my damage dice? I've never actually played a tabletop RPG so this'll be my first, so I guess my confusion is understandable.