Here’s the lock of a door in my little Victorian house.
A Spindle is the piece of metal that can’t really be seen here, but it’s a square edged rod that connects the door Handle to the Latch, so as you turn the handle, the latch pulls in and the door opens. The Rose is a piece of wood or metal that sits at the base of the handle, so that the persistent turning doesn’t wear out the door. Similarly, an Escutcheon sits around a Keyhole to protect the door from poorly aimed keys scratching it. The Faceplate is simply a protective covering around the latch, which does not lock, and the Deadbolt , which can be locked if your landlord gives you the correct key for the aforementioned Keyhole.