Prior to inviting people and creating any repositories, let's examine two important settings and set some defaults. Head over to the Settings page and select the Member privileges tab:
As you can see, there are various settings regarding the repositories. The first is about repository creation, and if enabled, any member of the organization will be able to create repositories under the organization namespace.
Enable this if you want to work more openly and disable it to be more strict. By disabling it, only owners will be able to create repositories. Outside collaborators (see the Difference between Members and Outside collaborators section) will not be able to create any repositories regardless of this option.
The next two options are for members with admin permissions on repositories. You can enable or disable the repository deletion and their...