Create React App

Install npm package manager before proceeding forward. Click Here

Step: 1 Creating react app npm package manager

 sudo npm install -g create-react-app  

  create-react-app my-app   

Navigate into my-app directory

 cd my-app  

Start your application

 npm start  

Now your application is served and you will be able to see output on your browser

 http://localhost:3000/  

Note :
If you run into error specified below

 ERROR: npm 5 is not supported yet  

Then you need to install 4.6.1 version globally with following command and follow the step one again.

 sudo npm i -g npm@4.6.1  

Useful links 
A re-introduction to JavaScript 
Reactjs