Take a moment to have a look at the base of chair and table legs. Chances are that these will have nail in studs made of either metal or hard plastic. These are primarily there to minimize compression marks in carpeting. However they can cause lasting damage on a hardwood floor- indenting the wear layer and scratching off the lacquer.

However these are quite simple to remove- either lever out with a screw driver or pull them out with a pair of pliers.

Your can then fit propriety felt based protector pads
to the furniture legs. These will give numerous benefits. They will eliminate scratching from the furniture feet. They will make moving furniture far easier, and also quieter.