"The Duolingo Playbook," podcast examines the inner workings of the language-learning app. The. podcastexplores a key principle that guides Duolingo's strategy and culture. The podcast talks about principles, such as long-term thinking, excellence, rapid iteration, data-driven decision-making, and the importance of fun. Duolingo's framework, "The Green Machine," highlighs how they achieve their goals through a six-step playbook.