It really isn't basically just describing what a noun is. It's about the surprisingly subtle logical structure underlying how we use noun phrases; about qualif

It really isn't basically just describing what a noun is. It's about the surprisingly subtle logical structure underlying how we use noun phrases; about qualifiers like "a", "some" and "the"; about a perhaps-surprising feature of language, namely that to the best way to explain what some term means may involve explaining how to rewrite whole sentences including that term in a different form.