None. Wax adds nothing to a polyurethane finish. Will not prevent scratching or abrasions. Just adds wax/silicon(depending on brand and product) to cause more cleaning problems.

You can use Bona hardwood floor cleaner with one of those microfiber cleaning pads.

But don't use any wax - it just builds up - may turn whitish in the cracks.

Wax is a BIG no-no on polyurethane/urethane finished hardwood floors. Big time no-no. So big, it can prevent future refinishings = very expensive yet USELESS hardwood floor that needs to be ripped out after 20-30 years. That is a very expensive lesson that MANY people have learned. You don't need to be one of them.

Cleaning hardwood = sweeping multiple times per week (vacuuming with beater-bar turned OFF is the mechanized version of sweeping = perfectly fine). A "damp" cleaning (very, very, very limited amount of moisture on the pad) is done roughly once per week - water ONLY. This is with a microfibre mop/pad ($15 at Home Depot). The pad is very lightly misted with water and then swept across the wood very quickly. Just enough to get the fine dust that is not collected by sweeping/vacuuming.

Then about 1 per month, you then CLEAN the hardwood using a pH neutral hardwood floor cleaner. Again the cleaner is misted onto to the head of the microfibre mop (just barely damp) and then it is swept across the surface.

If you want "shiny" floors you need to start out with a SHINY finish. If you chose matte or satin finish and find it too dull (you want to pep it up - give it some "life") then you need to have another coat of finish added - in a higher gloss. Wax is NOT to be used to increase shine. It is not be to used at all on poly/urethane finishes.

Good luck. Put down the wax. Put down the polish. Pick-up a microfibre mop and a brand name hardwood floor cleaner (should say "Does not leave a residue" on the bottle). Do NOT use steam cleaners. Do NOT use swiffer products of ANY TYPE.

I've done it a few times (maybe 3 times in 30 years) for people who wanted the wax look and maintenance, with some added moisture resistance. We would generally apply stain and a poly coat, wait several weeks, buff with fine steel wool, apply paste wax (Butchers, DuraSeal, Johnson, etc.) and buff. The poly must cure a bit before going over with wax. This finish would be a throwback to when people used shellac and waxed over it.

Most people don't want wax maintenance and don't own a buffer. If they do at this point, they could have an oil finish or hardwax oil. Waxing makes a floor incredibly slippery, like soapy water on a smooth concrete floor.