In this post we gonna see how we can deploy a React.js app using github pages:
- Step1
In the root

    git init
    git add .
    git commit -m "comment"

    - create a repository on github and 
    - copy the commmands

- Step 2
    npm install gh-pages --save-dev

- Step 3
    Edit file
{
    package.json
  homepage:https://USERNAME.github.io/REPOSITORYNAME/

    // BELOW START SCRIPT
    predeploy:npm run build
    deploy:gh-pages -d build
}
    package.json

- Step 4
    Step 1 one more time but add:
    git push

- Step 5
    npm run deploy
    and go to the settings page on github repository
    the page will be ready in few minutes