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Another popular approach to setting up users is roles. This concept is basically about identifying certain roles that users can take and then allow for a very easy application of these roles to users.
TYPO3 CMS access control is far more flexible and allows for such detailed configuration that it lies very far from the simple and straight forward concept of roles. This is necessary as the foundation if a system like TYPO3 CMS should fit many possible usages.
However it is perfectly possible to create groups that act like "roles". This is what you should do:
Identify the roles you need; Developer, Administrator, Editor, Super User, User, ... etc.
Configure a group for each role: attribute permissions needed to fulfill each role.
Consider having a general group which all other groups includes - this would basically configure a shared set of permissions for all users.