Hi @martina54439202
The App Builder (formerly known as Project Firefly ) docs can be found here https://developer.adobe.com/app-builder/docs/overview/
You can bootstrap a headless app with the command:
aio app init --no-extensions
then you can select the components to enable for this app, choose "Actions" to deploy I/O Runtime actions.
You can add new actions to your app with:
aio app add action
For storage, you can use either one of the following options depending on your use case:
I recommend to read through the Todo App Code Lab that shows how to build a Todo App with App Builder using aio-lib-state as storage library and React Spectrum components.
Regards,
Stephan