To run the application you need to have installed Nodejs & npm. To install them you can easily follow this guide of the official nodejs website.
The guide provides you all the details for several Linux distros, for Windows and Mac.
Once you have installed the requirements you can install the software dependencies using the package manager npm in the following way:
npm install
Well, now you are available to run the application using the ng tool with the following command:
ng serve -o
The -o parameter is optional, it will open you the web application in your browser automatically but you can also avoid it and open it manually.
Run ng build to build the project. The build artifacts will be stored in the dist/ directory. Use the --prod flag for a production build.
Run ng test to execute the unit tests via Karma.
Run ng e2e to execute the end-to-end tests via Protractor.
To get more help on the Angular CLI use ng help or go check out the Angular CLI README.