" Whether you’re currently a marketing executive or a college grad about to enter the field—the first growth hackers have pioneered a new way. Some of their strategies are incredibly technical and complex. The strategies also change constantly; in fact, occasionally it might work only one time. This book is short because it sticks with the timeless parts. I also won’t weigh you down with heavy concepts like “cohort analysis” and “viral coefficients.”* Instead, we will focus on the mindset—it’s far and away the most important part. I start and end with my own experiences in this book, not because I am anyone special but because I think they illustrate a microcosm of the industry itself. The old way—where product development and "

― Ryan Holiday , Growth Hacker Marketing: A Primer on the Future of PR, Marketing, and Advertising