I don't think Tailwind is the place to start learning CSS. Tailwind is just a more efficient way to write CSS, and you should be aware of what's going on under the hood. It doesn't mean if you're writing your CSS in Tailwind you're never gonna look at normal CSS. There's plenty of times when I'm iterating on a design and I'll hop into the "Styles" section of my console and directly edit the element.style{} section, writing normal CSS to mock something out before translating it back into Tailwind in my editor.
So I certainly haven't forgotten normal CSS names. Not to mention the Tailwind names generally match up pretty closely with the underlying CSS names. It's only minor translations to go between the two, and maybe a special case here or there. The documentation[1] is very good with a quick search can type CSS or Tailwind names into to find what you want, and it'll show both the Tailwind name and the CSS attributes/values it outputs so I tend to keep that open in a tab while I work.