The Messy middle by Scott Belsky
Most startup stories describe the most romantic parts of a venture, from starting in a garage or college dorm to successfully doing a multi-billion dollar IPO.
Scott Belsky, who is a bestselling author, entrepreneur, Chief Product Officer at Adobe, and product advisor to many of today's top start-ups, goes about it differently. He dedicates this book to the messy middle, the middle stretch, which is the least talked about, but probably the most important part of any venture.
The book is broken into 3 sections
Endure the roller coaster of successes and failures
Optimize what’s working