This document outlines 21 growth hacking techniques for growing a business. It begins with 3 rules for growth hacking: continuously learn, lead by example, and act ethically. It then discusses the AARRR customer acquisition model and specific growth hacking techniques like using LinkedIn to find leads, automating relationships through email campaigns, increasing social status by engaging others' profiles, leveraging Fiverr for outsourced SEO, creating an online course to generate leads, benchmarking competitors, creating automated workflows with Zapier, analyzing popular content with Buzzsumo, optimizing keywords with Moz or Google, going viral through network effects, dominating Quora, issuing press releases, participating in conferences virtually, newsjacking trends on Twitter,