Following is a simple sample on building an demo react-native app
With basic navigations

1, Create a sample app
npm expo-cli init MyApp --npm

2, Install React Navigation
npm install react-navigation

3, Install dependencies
expo install react-native-gesture-handler react-native-reanimated react-native-screens react-native-safe-area-context @react-native-community/masked-view
npm install react-navigation-stack @react-native-community/masked-view

4, Install React Navigation Stack
npm install react-navigation

5, Start the app and clear cache
expo r -c