What are the potential causes of drag marks on a wood floor and how can they be effectively removed or repaired?

Potential causes of drag marks on a wood floor include heavy furniture being moved across the floor, improper cleaning techniques, or sharp objects scraping the surface. To effectively remove or repair drag marks, you can try using a wood floor cleaner and a soft cloth to gently scrub the affected area. For deeper scratches, consider using a wood filler or sanding and refinishing the floor.