So here is something I learned from each one. If you're interested in being a writer I strongly encourage you to purchase these three books. They will save you so much time, so much frustration and teach you so much. Of course, tell me the other craft books you love in the comments because I'm always looking to add to my collection!
On Writing Well by William Zinsser
Bird by Bird by Anne Lamott
Anne Lamott taught me to be patient with my writing. Prior to reading her book I had a horrible habit of writing everything as though it was the final draft, which is neither helpful nor productive. You don't have to keep every word you write. You simply have to write. And to take each piece of work page by page, bird by bird.
On Writing by Stephen King
Someone recently pointed out that I quote this book often. It's true. I do. Because this book made me feel like a writer. This book taught me to think like a writer, to live my life like a writer. This book taught me more about writing, and gave me more confidence in my craft, than any other book I have read. And if you can only afford one of these three books, this is the one.