I find concrete sealers are super simple to apply. Just clear the concrete, let it dry, then use the sealer having a mop. It gained’t alter the colour from the concrete, but will darken it a bit and add some gloss. You’ll really need to reapply it annually or so https://mcgepoxycoatings.com/epoxy-vs-untreated-concrete-garage-flooring-which-one-is-best/