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A slab door is a standalone door without a frame or hardware. A prehung door is a complete set that includes the door, frame, hinges, and sometimes the doorknob and lockset.

In most cases, a prehung door is the better and easier option to install, especially for DIY projects or exterior applications, as they often come pre-weatherproofed. They require fewer tools and less experience to install properly. Although prehung doors are heavier and have a higher upfront cost, the investment is often worthwhile for a complete upgrade that includes a new frame.

A slab door may be a better choice if you are on a tight budget, have a custom-sized wall opening, or only need to replace the door while keeping the existing frame. While the initial cost is lower, you will need to purchase all the hardware separately and do more DIY work to hang it, which may not result in significant time or money savings.

Instead of a bifold door, you might look into installing French doors, pocket doors, or sliding doors. Each has its own pros and cons. French doors offer the dual-door advantages that bifold doors do, and pocket doors are excellent space savers—though you’ll need to create a wall cavity to have them installed. 

If you’re installing a pocket door into an existing door opening, the new space will need to be twice the width of the existing door, plus an inch. You'll need to double that number if you’re adding dual pocket doors.

Yes, you need to install a sill for an exterior door. A sill offers structural support for the doorframe and creates a place to install the threshold, which is essential for keeping water from seeping underneath the door and into the home. Door sills are not necessary for interior doors.