Instances of Postgres, Mongo and Redis databases can be created in Docker using docker-compose file provided with the project. Just run make infra or docker-compose up -d and it should install and start the databases.
For Firestore, you need to create a new project in Firebase console (https://console.firebase.google.com/).
For the Firebase demos, you need to add a service role certificate for your firebase project into ./src/firebase/service-account.json.
Install required dependencies (npm install).
The project is setup to be executed inside VSCode using the launch task. Just open a file with a demo and hit F5 or use Run and Debug tab.