Retaining users in mobile apps is challenging, with 71% of users churning within 90 days, often due to a lack of understanding of how to use the app effectively. A successful onboarding process is crucial for user retention and can be tailored to highlight emotional value, showcase competitive features, deliver the first "A-ha Moment," or personalize the experience. Effective onboarding strategies differ based on app type and target users, requiring continuous testing and iteration. Examples include Evernote's value-oriented approach, TIDAL's feature-focused onboarding, Clash Royale's interactive tutorial, and Duolingo's personalized flow. Additionally, different signup flows, such as immediate, interrupted, or try-before-you-buy, cater to varying user preferences and app recognition levels, with considerations for progress tracking, opt-out options, and engagement strategies for multi-session users.