Components of the doors are much more than the handles. Generally, we do not pay much attention to the doors. As soon as we finish the picking of the door, we almost forget about them and all of the constituent parts. But, the doors have many parts. And, it is good to get familiar with them in case you need to repair something. Typically, the doors have cases or frames, threshold, hinges, locks. Also, some of them have mullions and panels.
Components of the Doors and Their Characteristics
Finally, see the pictures below and see what parts are unfamiliar for you.