To develop locally you need to configure a firestore database via firebase from here. With this, you need to provide the following environment variables from the firebase settings in a .env file locally:

FIREBASE_API_KEY
FIREBASE_AUTH_DOMAIN
FIREBASE_DATABASE_URL
FIREBASE_PROJECT_ID
FIREBASE_STORAGE_BUCKET
FIREBASE_MSG_SENDER_ID

Run ng serve for a dev server. Navigate to http://localhost:4200/. The app will automatically reload if you change any of the source files.

Run ng generate component component-name to generate a new component. You can also use ng generate directive|pipe|service|class|guard|interface|enum|module.

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.