If you're really starting out from square 1, I might read this book first: https://www.amazon.com/Database-Design-Mere-Mortals-Annivers... (although I read an earlier edition). The Art of SQL is a great book, but I wish I'd read something a bit...easier...first, lol. I struggled with it.

Yeah well, I am old school (or at least old) so I had already a good grasp of SQL, but I think the book is good because it explains overarching concepts very well.