I have made a cabinet style cutout in the drywall and finished with dry wall. Now I want to install a glass door to this drywall and want to know how and best way to do it.
Gypsum board will not support a glass door, unless the door is tiny (like a 6" square).
You will need a frame which goes all around the opening and is secured to a structural member, like a stud. Then the door is attached with hinges to the frame and a latch or latches are installed on the other side of the frame.