This document outlines 10 essentials for a great mobile experience: 1) visual aesthetics like readable and usable design, 2) animations and transitions that add fun, 3) onboarding for new applications, 4) error handling and offline functionality, 5) thoughtful app icons and screenshots, 6) notification experiences, 7) platform-specific Android and iOS details, 8) empty states, 9) being polite with user permissions, and 10) surprising and delighting users. The keys to a great app are that it's not just about features, attention to details is important, and developers should avoid "building crap".