Fallout is a videogame made by Obsidian and Bethesda. it is enjoyed by many. I will now list some of the common enemy types
Raider is probably the most common enemy. They carry ammo and guns that you can loot off of their body if you kill them
Super Mutants are the scourge that occupies the majority of the capitol wasteland. They are the main enemy is fallout 3 and commonly carry Miniguns, Rocket lauchers, or Fat-Mans
Centaurs are the "Pets" of super mutants. they do not commonly carry any weapons or loot. They are disgusting.
BOS (Brotherhood of Steel) is a group of soldiers in power-armor who will either attack or help you depending on who you side with. They commonly carry high-tech weaponry and power armor