install React Native
fist install Node.js
https://nodejs.org/en/download/
2- install react native using npm
https://facebook.github.io/react-native/docs/getting-started
problem :
H:\>npm install -g expo-cli
npm ERR! code SELF_SIGNED_CERT_IN_CHAIN
npm ERR! errno SELF_SIGNED_CERT_IN_CHAIN
npm ERR! request to https://registry.npmjs.org/expo-cli failed, reason: self signed certificate in certificate chain
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\username\AppData\Roaming\npm-cache\_logs\2019-01-20T11_00_33_490Z-debug.log
fix :
H:\>npm config set prefix "D:\Program Files\nodejs\cash\AppData\Local\npm"
H:\>npm config set cache "D:\Program Files\nodejs\cash\AppData\Local\npm"
H:\>npm config set strict-ssl false
H:\>npm install -g expo-cli
