GitHub also offers the following documentation to get started and learn more about using it.
https://docs.github.com/en/enterprise-cloud@latest/get-started
https://docs.github.com/en/enterprise-cloud@latest/get-started/quickstart
Background
The Tufts enterprise license for Github does accommodate the ability to create additional Github organizations, but there are many caveats associated with this and it is usually not recommended to do so. To quote Github best practices:
...
setup of authentication, such as Shibboleth or Active Directory
note: if Shibboleth is used, any user with valid Tufts credentials has the potential for read access to internal repositories and additional care must be used to scope repository visibility and permissions to a suitable level
maintenance of related AD groups
specifically managing access for any cross-group collaborators
troubleshooting situations where a user isn’t able to see
contacting Github support in the event of issues
...