Here are some of the best books I've learned from (thus far)
Self-editing for Fiction Writers by Renni Browne & Dave King - excellent content, written by experienced editors
Keys to Great Writing by Stephen Wilburg - good content, author wrote from experience, clear, easy to understand and apply
Rivet Your Reader with Deep Point of View by Jill Elizabeth Nelson - very short - ~60 pages - great content, direct and to the point with lots of examples
Plot versus Character by Jeff Goerke - well presented, organized
Writing 21st Century Fiction by Donald Maass - Once you've got the basics down, this book has lots of really great content on taking your writing to the next level.