If you still don't have a node.js go to https://nodejs.org/en/
and download the recommended for most users version.
Note that you’ll need to have Node 8.16.0 or Node 10.16.0 or later version on your local development machine
Download files into your local machine and open terminal in root folder. Then follow the instructions.
Insert this command into your terminal. It'll install necessary npm dependencies in the project
Runs the app in development mode. Open http://localhost:3000 to view it in the browser.
The page will automatically reload if you make changes to the code.