install yarn globally command code example
Example 1: yarn add global
yarn global <add/bin/list/remove/upgrade> [--prefix]
Example 2: yarn react install
There are two ways where you can initiate a REACT app..
1. Using npm : npm init react-app <app_name>
example : npm init react-app sampleApp
2. Using yarn : yarn create react-app <app_name>
example : yarn create react-app sampleApp