julia On Android and GrapheneOS, each app has its own internal space to store its data and no other app can access this data directly except by communicating with the app that has this data in its internal space only in the ways this app has let other apps communicate with it. Additionally, there's a home folder in the shared portion of the storage. It's like the home folder on your computer, it's where all the "Download", "Documents", "DCIM", "Pictures", "Movies", etc. folders are, and it's called the "shared storage" because when you grant an app the Files, Pictures and videos, Music, or All Files permissions this is the same folder they all get access to and it's shared among them. The Storage Scopes feature is called this way because you can let an app think that you've granted it one of these permissions, but in practice it can only see and access the specific subfolders and files that you manually specify yourself to the specific app, so the app is accessing the shared storage through the "scope" that you created for it. EDIT: Apps can create their own folders and files anywhere they want without permissions at all, and then they can modify and delete the files that they created without permission. In addition, if an app knows the path to one of your files but you've restricted it with the Storage Scopes feature, they can't do anything to it because Storage Scopes doesn't just restrict the app's sight of your storage but it's also a security feature preventing them from touching the files out of their scope.
julia Don't feel bad for lacking knowledge. Knowledge can be learnt.