It is either a monster that can function as an Equip card through its own effect, such as Union monsters, or, it is a monster forcibly equipped by another card's effect such as Relinquished's ignition effect.
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Same as when you use a regular Equip Spell card on the opponent's monster, the monster acting as an Equip Spell Card goes to your own S/T zone.
A spirit monster is a monster that usually has the ability to return to the players hand. also, some spirit monsters have special equip items that go with them
The Equip happens on resolution of an Ignition Effect. Book of Moon can be chained to that. The target monster will flip face-down and then the Equip effect will resolve without effect because it can't equip to a Set monster. Inzektor Hornet will not move from whatever zone it started in.
Yes and no. If it says to for the cards effect or other card effect, then yes. Otherwise, no you must be given the ability to via card play.
Five-Headed Dragon