Michelle Hoover, author and Novel Incubator instructor at Grub Street in Boston, who hosts the 7AM Novelist podcasts and substack posts, is an excellent teacher of craft. Here is her selection of craft books:

https://bookshop.org/lists/best-craft-books-for-wanna-be-wanna-be-better-writers

Romance stories have a very formulaic structure that editors are looking for, and Gwen Hayes's book "Romancing the Beat" can help you. If you follow this structure with your own creative work, you'll be ahead of those writers who aren't aware of the importance of hitting all these structural beats. Great tool for outlining your novel.

https://www.amazon.com/Romancing-Beat-Structure-Romance-Kissing-ebook/dp/B01DSJSURY

Narrative Magazine, which offers its expansive library of thousands of stories, poems, essays, cartoons, and more to readers everywhere for free, has also compiled booklists for aspiring and seasoned writers alike.

Best Books on Writing — https://www.narrativemagazine.com/writers-resources/books-on-writing

Best Advice on Writing — http://www.narrativemagazine.com/writers-resources/best-advice

Here is a great list of books to help writers improve their craft: https://www.pw.org/best-books-for-writers