Let's Get Visible by David Gaughran
This amazing resource for authors outlines several strategies authors can apply to help their books gain visibility during different phases of the publishing process. Some of the items discussed include how the Amazon algorithms and book lists work, which advertising options are worth investing in, and how to make BISAC categories work for you. The author does a superb job organizing a plethora of information in a way that is crystal clear and never too overwhelming.
There are things within and beyond our control as authors, and Gaughran never promises success, but he does take the mystery out of digital publishing by discussing several approaches authors can take to give their books a better shot. This is an excellent reference work that all independent writers and publishers should own.