create an app react native code example

Example 1: create react native app

npx react-native init AwesomeProject

Example 2: how to run react native app

react-native run-android 
react-native run-ios

Example 3: create react native app

expo init my-project
//or
create-react-native-app my-project

cd my-project

//install react native navigation
npm install @react-navigation/native
npm install @react-navigation/stack

expo install react-native-gesture-handler react-native-reanimated react-native-screens react-native-safe-area-context @react-native-community/masked-view