Piano Answers

I recently moved a spinnet piano with a friend’s help into my rental house, & we placed it on a carpet to move it across the room.
This left light scuff mark lines across the floor where the wheels were that are only visible in direct sunlight.
I understand there are scuff removers for hardwood floors, should I get this or is this for other types of scuffing like shoe marks? If not, what way could I clean/fix this?

We have an artificial wood flooring in our kitchen. Over the last year, esp. below the refrigerator water dispenser we’ve greatly damaged our floor from all the drips of water from doing the dishes, cooking, etc.
We were amazed when we lifted some carpeting under our piano how beautiful & shiny it originally was. Now we’re sad because we obviously don’t know how to take care of this flooring.
I’m not sure what type of floor it is… We dropped a hammer on it & gouged it & it appears that it has a thin top surface & the main body of the floor is some type of cheaper wood or other wood-like material; it’s a cheap house.
What is the best way to:
1) Repair the water damage… Can a laminate floor (or whatever) it is be stripped? I believe we CAN NOT sand it because the top layer is so thin. Would I just go to Home Depot or Lowe’s & ask for stripping products?
2) How can I protect our floor going forward? Consumer wax products seem to last a couple of weeks then go dull… not a permanent solution. Can I go to a hardware store & buy a polyurethane-type varnish & paint it on as a longer-term solution?