If you have absolutely no idea what anybody’s talking about above, find a local detailer that will single stage polish the car for you. That should be a couple hundred bucks. It will so totally be worth it be before you go out and buy a polisher, product, pads etc. Then you can wipe on a sealant very easily there are millions of them that are good, all you need to do is keep reading here about several of them. Most of them wipe on ,create some sort of haze and wipe off and last six months or so , some even longer. That’s what I would do if I didn’t know anything about Detailing, because once you go down this rabbit hole,It can be a lot of time and money. Which may or may not be your style.
But yeah , to get the car looking good and have a sealant or a wax stay on the car, you need to polish it first. Either you do that or have it done. It is so totally worth it. Just like when you buy all unpainted furniture, you don’t just stain or varnish it, you sand it first. Same applies here.