Anyone read Ursula Le Guin's Steering the Craft? Not the original 1998 version (I didn't even know she wrote one), but this 2015 updated version. I'm adding it to my to-read list. Here is an article about it.
So far I've been relying mostly on Stephen King's On Writing, Strunk & White's The Elements of Style, and Verlyn Klinkenborg's Several Short Sentences About Writing. Oh, and I also added Hemingway's Ernest Hemingway on Writing to my reading list too.