If you're interested in learning how writers write, check out The Paris Review Interviews series. For decades they've been talking with some of the best: https://store.theparisreview.org/products/the-paris-review-interviews-i
For someone like me who's can get a bit obsessed with process, these interviews read themselves.
My favorite book about writing is Writing Down The Bones. https://nataliegoldberg.com/books/writing-down-the-bones/
It motivated me to write a lot more and with less purpose. Very freeing.