To build your first react native app, you can start by using the react native starter app for mitter.io. To get it, clone the repo:
git clone https://github.com/mitterio/react-native-starter.git
And then use
npm to install all the dependencies:
yarn install # or npm install
Unlike the other starter apps, the react-native apps require some additional setup from your side before the application can be run. To do so, follow the setup instructions on the React native reference page.
Once your application is setup, you can follow the tutorial for your first web app as it uses the exact same components/modules and API for the starter app.