Complete guide for building native Expo apps with routing, styling, components, and platform conventions.

• Covers Expo Router fundamentals, native tabs, stack navigation, modals, and form sheets with detailed route structure conventions
• Includes styling rules aligned with Apple Human Interface Guidelines: flexbox layouts, safe area handling, animations, shadows via CSS boxShadow, and responsive design patterns
• Documents library preferences (expo-image for SF Symbols, expo-audio, expo-video, expo-glass-effect) and anti-patterns to avoid (legacy modules, intrinsic HTML elements, StyleSheet over inline styles)
• Provides reference guides for animations, controls, search, storage, visual effects, WebGPU/3D graphics, and zoom transitions
• Emphasizes testing in Expo Go first before creating custom builds, with clear guidance on when native code is actually required