I have hw floors in a 50-year-old house. The floors are in good shape except for a few scratches where file cabinets, frig, etc., were moved. How can I fix those minor scratches without sanding the entire floor? Are there products out there for doing such repairs? Note that I plan to buff all the floors just as regular maintenance.

not sure how deep or extensive these scatches are, but for smal jobs you could try the furniture scratch crayons, filling the scratch with the wax. Worked well on my stairs.