This book is about entrepreneurship, and more especially, about what you should do before starting your business. It originated from a blog post, which received many comments and shares, and thereafter the author, Giff Constable, made it into a book. It is listed at 88 pages on Amazon.
It is almost a required reading for many entrepreneurship courses in universities, and highly recommended by Steve Blank, Silicon Valley serial-entrepreneur and originator of the Lean Startup movement. The book is made free by the author, and you can get it from his website at: here.