Here is an example of permissions for a public space in teamwork. The screenshot shows the permissions of this IRC-IT space.
The groups "CDN-Alumni", "confluence-users", "Confluence-Users-LDAP" all have the same permissions assigned, which are the same as for "anonymous" users. That ensures, that even after login to teamwork, users can see this space as they can see it without logging in.
In addition, all members of IRC-IT (which is cost center 4020) have additional permissions for maintaining content and managing the space.
See Groups to use for assigning permissions for further explanations of which accounts each group consists of, and which groups are available for assigning permissions.