A practical walkthrough for setting up a React Native development environment from scratch on a new machine. Covers installing Node.js with nvm via Homebrew, configuring iOS tools (Xcode, CocoaPods, iOS Simulator), and Android tools (Android Studio, JDK, SDK Command-line Tools, environment variables). Also includes tips for fixing Android emulator keyboard settings and downloading custom device skins, plus instructions for running apps via React Native CLI or Expo.
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