For the specific case of light switches, ironically, sometimes all you have to do is not shop at big box stores. If you buy the exact same 5262 receptacle from Home Depot or from Zoro, you'll see they're completely different beasts! This is pretty brazen -- usually HD has the decency to add a suffix to the cheap-out version.

Longer form: there are three major manufacturers of switches and receptacles: Hubbell (Bryant), Leviton, and Pass&Seymour-Legrand. Hubbell is generally the highest price and quality. Leviton switches just feel "right" to me. I don't care for P&S much even though there's nothing wrong with them. All are completely interchangeable except for small visual details. This is really only noticable on wallplates (Hubbell stainless wallplates look the best -- and they're 302/304 SS so they don't rust in bathrooms like the 400 series trash at HD) and, if you mix them too nearby, switch rockers.

Pick your brand, then get their PDF catalog and find some part numbers. (There are plenty of other ways to do this, I just find catalogs effective.) You want "frameless" switches if you're going down this path: "framed" switches are the consumer junk you're running away from. (I dislike Decora -- I think it's harder to operate in the dark, and that's kind of a thing for light switches, but if it's your thing, go for it.) You'll find many possible part numbers to pick from. You want ONLY things marked as "Fed Spec" (more formally W-C-596). A lot of lesser stuff is "Spec Grade", which is a cop-out for "we think this is up to spec but we didn't actually list it". "Fed Spec" means "yeah, this one's good". (I will accept "spec grade" for oddballs like weird configurations -- it's not like they sell a ton of those -- since it really is decent, but don't settle for that on your main switch or receptacle, because you don't have to.) You can buy the cheapest things that are actually Fed Spec and you'll be golden.

You don't need the high-end Extra Heavy Duty stuff unless you're outfitting a shop or something. And you probably don't want Hospital Grade with those annoying pull-out forces, ugly green dots, and hospital prices. But none of those will hurt anything but your pocketbook, if you are so inclined. You'll just never appreciate them.

You should, for receptacles, get the ones that are Back And Side Wired. That means the side screws and the holes on the back, with the screw needed to grab the holes (i.e. not those horrid stabby-only holes on the super cheap receptacles). I made this mistake (Leviton BR15 vs CR15) and regretted it during install. Oh well.

If in doubt, look for the part number with the most color choices. It's probably popular for a reason. And don't forget that neon ("pilot") switches exist. They make understanding 3-ways and finding the staircase light in the dark way easier. Especially if the staircase lights are 3-way. Worth every penny!

Now that you have some part numbers, you just have to buy them from a trade supplier or industrial supplier and you're done! One place that's reliable is Zoro. They even used to have great pricing when they still offered coupons; seems those are rare now. But anywhere that's not big-box can sort you out.

Oh, and if this is your first time doing this, get a #1 square or Robertson screwdriver. No, not just a bit, you'll use it more than that and it's slimmer this way. The recesses on these things accept multiple bit shapes and I find that one by far the easiest to work with in that recess (due to the multiple-shape thing it's not great at holding any of them...).