Three years ago, I read Lawrence Block's Writing the Novel from Plot to Print. I read it again in 2018. In 2019, I re-read in more than once and found useful tips to keep me going.
When I saw that Block had published an updated version with "to Pixel" added to the title, I wasn't interested. The original, published in 1978, addresses all the fundamental problems a novelist must solve. Those things don't change. I didn't think a guy who has been traditionally published since the 1950s could have much to say about digital publishing. I was wrong.
In the early 2010s, Block began experimenting with self-publishing on Amazon, Nook, Kobo, and others. He speaks from experience. This updated version contains everything in the original plus three new chapters: "The Case for Self-Publishing," "The Case Against Self-Publishing," and "How to Be Your Own Publisher." His analysis is valuable.
Writing in 2016, he says repeatedly that digital self-publishing will continue changing, and indeed it has in the last three years. But here again he focuses essential problems---things that don't change. If your thinking of upping your game as a novelist, it's worth getting this new version.
I've also tried Block's Telling Lies for Fun and Profit. It's good, but there's a lot of overlap with Writing the Novel. Just get the 2016 expanded version and be done It is one of my three essential writing craft books.