An adapter is a way to override a default behaviour in Ghost. The default behaviour in Ghost is as following:
By default Ghost will upload your images to the content/images folder.
The LocalFileStorage is using the file system to read or write images.
This default adapter can be found in core/server/adapters/storage/LocalFileStorage.js.
By default Ghost will schedule your posts using a pure JavaScript solution.
It doesn't use cron or similar.
This default adapter can be found in core/server/adapters/scheduling/SchedulingDefault.js.
To override any of the default adapters, you have to add a folder (content/adapters/storage or content/adapters/scheduling) and copy your adapter to it.
Please follow our detailed guides: https://docs.ghost.org/v1/docs/using-a-custom-storage-module https://docs.ghost.org/v1/docs/using-a-custom-scheduling-module