Which command do you have to run for installing React Native? code example

Example 1: install react native cli

if you have nodejs in your system then open terminal and install 
react-native-cli globly  via 

sudo yarn add react-native-cli


npm install yarn  (if donot have yarn install)

to check nodejs via node -v and check package manager via npm -v

Example 2: how to install react native

down node js 
then npm i neact-native