OverviewAARRR (Acquisition, Activation, Retention, Referral, Revenue) is a framework for customer lifecycle.—Dave McClureRead More13 Mental Models Every Founder Should KnowMental models are to your brain as apps are to your smartphone. Just like apps, there are a ton of mental models. They help you make decisions, solve problems and see the world in an entirely new way... they basically make your brain more useful.medium.com