Over time these screws can work their way loose causing the bottom of the door to drag on the floor.
Stop door scraping floor.
You may use a drill with a screwdriver head attachment but you need to be careful not to overdrive the screws and break or strip them.
If you recently installed carpet or a new floor then you will need to plane the bottom of the door with either a hand planer or by sanding.
Use a pencil or a label to mark where you need to sand down.
If it does tighten the hinge screws with a ratcheting screwdriver.
The dragging door corner can scrape the floor or threshold underneath the bottom of the door which can tear vinyl floors and scratch wood floors.
Lift the door by grasping both handles and gently putting upward pressure.
Use a screwdriver to tighten the screws in the top hinge on the door and frame.
There is also a planer attachment for the dremels which works pretty well for light jobs and in some cases you can even do it without removing the door.
First run a piece of paper at the bottom of door to identify where is sticky.
When your door opens only part way and scrapes on the floor not allowing it to open fully don t rush for the plane to remove part of the bottom of the door without trying.