Yes, the Modern Language Association has a blog, “Behind the Style,” devoted to both well-known and obscure grammar and style practices. You may find material that you can use in a course you’re teaching or to answer questions in an office hour. The level is quite basic and would be suitable for first-year students.

Is the title of the blog a bemused acknowledgement that worrying about “the rules” is unfashionable? Perhaps another page explaining why grammar is relevant to today’s writing, “Helping Students Use Grammar to Support Their Writing Goals,” is an answer.