I find concrete sealers are super uncomplicated to use. Just thoroughly clean the concrete, let it dry, then implement the sealer using a mop. It won’t change the color of your concrete, but will darken it somewhat and insert some gloss. You’ll really need to reapply it yearly or so https://mcgepoxycoatings.com/epoxy-vs-untreated-concrete-garage-flooring-which-one-is-best/