Stop Door Scraping Floor

Use a pencil or a label to mark where you need to sand down.
Stop door scraping floor. 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. 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. Check to see if this relieves the rubbing. Use a screwdriver to tighten the screws in the top hinge on the door and frame.
First run a piece of paper at the bottom of door to identify where is sticky. If it does tighten the hinge screws with a ratcheting screwdriver. Over time these screws can work their way loose causing the bottom of the door to drag on the floor. 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.
You can get rid of the annoyance of lifting a. 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.