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Look at the door from the outside, or the key side. If the hinges are on the left side of the door, it’s a left-hand swing. If the hinges are on the right side of the door, it’s a right-hand swing. You can also think of it as which hand you would most likely use to open the door from the outside when considering whether it’s a right-hand vs. left-hand door.

No, exterior doors don’t need to be prehung, although choosing a door that is prehung makes the installation process far easier. Installing an exterior door that isn’t prehung requires carefully maneuvering the heavy door into place in your door frame, making sure it’s level and plumb on all sides, and then attaching the hinges so that they’re perfectly level and are affixed to the right part of your frame and door. Prehung exterior doors are far more DIY-friendly.

A door sill is the bottom portion of your door frame, while a threshold is the transition piece that separates the two types of flooring between rooms, or serves as the transition between the interior and exterior on an exterior door. The threshold sits on top of the door sill. A kick plate is a protective plate that sits against the face of a door to prevent damage to the door from feet and shoes. You’ll usually only find kick plates on exterior doors, while every door has a door sill, and most exterior and interior doors have a threshold.

The vast majority of hinges are symmetrical, and either side of the hinge can go on the door or the frame. Occasionally, you'll find a hinge specifically made for right or left-handed doors with different attachment hardware or larger plates on one side. In most cases, the large side of the hinge goes on the frame.

It is possible to install hinges backward, so be careful when placing them. Position the hinge so that the hinge pin faces the direction the door will swing. For example, if you're standing on the side the door will open into, the pin should be visible. Be extra careful when installing exterior doors, as placing the hinges on the outside for an outward-facing door makes your home much easier to break into.