I'm not much of a JS/TS/HTML/CSS person either. But if I think something looks off and it's something I care about, then I'll lose a day boning up on that thing.
To your point that you're not sure what to search for, I do the same thing I always do: I start searching for reference documentation, reading it, and augmenting that with whatever prominent code bases/projects I can find.
To your point that you're not sure what to search for, I do the same thing I always do: I start searching for reference documentation, reading it, and augmenting that with whatever prominent code bases/projects I can find.