These three books cover the three keys to successful products: idea validation (Mom Test), positioning (Obviously Awesome), and marketing (Traction). Start here if you're a new product manager or first time founder.
Obviously Awesome by April Dunford
A step by step guide on positioning - how to make your product stand out and drive sales through putting it in the right context for your customers. Knowing the product's correct context can shape strategy and product vision.
The Mom Test by Rob Fitzpatrick
Three rules for customer conversations that teaches you how to properly tell if your business idea is worth pursuing. This is the top book to read and apply before you write a line of code or spend a dollar on development.
Traction: How Any Startup Can Achieve Explosive Customer Growth by Gabriel Weinberg and Justin Mares
Learn a repeatable process to picking the right marketing channels for your business. Includes starting advice for nineteen different channel options.