stuck on seeing what keywords a website is using

If it's someone else's site you need a tool that estimates it: Semrush, Ahrefs, Ubersuggest etc all have an organic keywords report where you type in the domain. They're estimates from their own databases, so treat the numbers as a rough guide, but the list of terms is useful. Free way, slower: look at their page titles and H1s, that's usually what they're targeting. If it's your own site, Search Console shows the real queries.