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React Native is an open-source framework created by Facebook for building native mobile applications using JavaScript and React. It enables developers to write once and deploy to both iOS and Android platforms while delivering a native look and feel.
This guide covers React Native fundamentals, component lifecycle, styling with Flexbox, navigation with React Navigation, state management with Redux/Context, accessing device APIs, integrating native modules, testing, troubleshooting, performance optimization, and deployment to App Store & Google Play.
Whether you're a web developer transitioning to mobile or an experienced app developer seeking cross-platform efficiency, these notes provide a thorough reference for professional React Native development.