Can You Stack Equipment Mtg?

Yes, "equipping an equipment" is an activated ability and as such goes on the stack and can be responded to. An opponent may target (e.g. destroy) the creature or the equipment itself.

Can you put multiple equipment on a creature?

An Equipment can't equip more than one creature. If a spell or ability would cause an Equipment to equip more than one creature, the Equipment's controller chooses which creature it equips.

Does equipment go on the stack?

the equip ability is just a normal activated ability that has a timing restriction. it uses the stack and doesn't do anything until it resolves. you can terror the creature in response to your opponent equipping it. It goes on the stack and can be responded to like anything else.