This source code is part of Maximilian Schwarzmüller's "Progressive Web Apps - Complete Guide" course on udemy.com.
You need Node.js installed on your machine. Simply download the installer from nodejs.org and go through the installation steps.
Once Node.js is installed, open your command prompt or terminal and navigate into this project folder. There, run npm install to install all required dependencies.
Finally, run npm start to start the development server and visit localhost:3000 to see the running application.