Gaughran goes in detail into how the Amazon sales ranking works (just sales - reviews, free downloads and price don't make a difference), as well as how Amazon creates its recommendations, popularity lists, top rated charts and category best sellers. This is all valuable information for the self-published author, even if some of it you probably worked out for yourself. "Let's Get Visible" also discusses the now diminished power to boost sales through free download offers, and explains promotions, advertising, KDP Select and other relevant issues and tools. It's a comprehensive guide to all that the self-published author needs to know.
Thanks to this book I adjusted the categories in which "Milligan and the Samurai Rebels" was listed, and after a few good days reached as high as #4 on Amazon UK's Political>Humour bestseller list. Not quite fame and fortune, but thanks to this book I have indeed become more visible.