Best stories about ghouls in Lovecraft?

I'm interested in knowing more about Lovecraft’s ghouls, how they live, what their society is like (if they even have one), and how they come into existence. From what I’ve read, it seems like some humans actually turn into ghouls over time.

I know Pickman’s Model and The Dream-Quest of Unknown Kadath touch on them, but are there other stories that go deeper into their nature? Also, are there any cases where someone is a ghoul without realizing it? And would that even be possible, given how they function?

Would love to hear recommendations or even your own takes on how Lovecraft portrayed them.