Areas

If a user or group has backend access, it's possible to define which areas are visible and can be used.

Content Starts

Sometimes is a good point, to limit the content tree by setting a root node. 

Media Starts

The same as content, limits the access to media.

Data Sets

The same as content, limits the access to data sets.

Allow Blob Access

Can be relevant for accessing images via GraphQL, to allow the access to blobs and their urls.

Is Administrator

If this is checked, the user has permission to everything.