When using Yarn keep in mind that you need to run additional services for the app to function properly. You can use docker as described below. If you decide to use another method you will probably need to change the default configuration.
Runs the app in the development mode.
Open http://localhost:3000 to view it in the browser.
The page will reload if you make edits.
You will also see some lint errors in the console.
Builds the app for production to the build folder.
It correctly bundles
React in production mode and optimizes the build for the best performance.
Builds a production-ready image.
Runs app container and other containers (PostgreSQL, Authorization Service, Expendity Server, etc...) and builds app image if does not exist.