The standard User group tree is:

everybody
|- humans
|- known users
|- new members -> members -> senior members
|- new editors -> editors -> senior editors -> sysadmin

Groups inherit permissions from lower ranks.

The standard content groups are:

- public
- protected
- persons
- metadata
- forum
- imported
- editorial
- templates
- system related content

Public

Public is for public content. Everybody can view this, new members and new editors can create and modify content. Members and editors can publish and delete public content.

Protected

Similar to Public, only logged in users can view this.

Persons

All the Persons of the users are in Persons. New members and new editors can modify and publish, senior editors can delete this.

Metadata

Used for Roles, Types, Keywords, Languages, Listpublishes and Listedits

Forum

Used for Topics and Notes.

Imported

Used for content imported via sharing from other systems.

Editorial

Only new editors can view this.

Templates

Used for templates. Only Sysadmin have access to them.
- system related content