There are tons of monsters in Diablo III, some spit acid, some charge you and some spawn more monsters. But they all come down to one basic strategy to beat them: keep clicking!
There are a few rare and magical monsters you have to watch out for. There are blue champion monsters that come in packs and have some sort of ability. So far we’ve seen teleporters, Nightmarish monsters who cast fear spells on players and knockback monsters. There are Wallers that raise stone barriers to block you off or trap you in a three-walled prison. Also there are jailers who root players in place. These packs of champions are guaranteed to drop some decent magical loot.
Monsters with gold names are unique enemies that spawn randomly with random properties. They usually spawn with a couple minions that share their properties but aren’t as tough. It’s a good idea to take out the minions before you start on the master, so you don’t have a lot of special abilities procing all the time.
If you ever see a treasure goblin, kill it! Kill it as fast as you can! These little misfits will run around the stage dropping bits of gold as they go. They drop some nice blue items when they die, but if you wait too long they will summon a portal and disappear forever.