Creating a new organization from scratch
Create an organization to apply fine-grained access permissions to repositories.
When you create a new organization from scratch, it doesn't have any repositories associated with it. For more information on adding repositories to your organization, see "Creating a new repository" and "Transferring a repository."
In the upper-right corner of any page, click your profile photo, then click Settings.
In your user settings sidebar, click Organizations.
In the "Organizations" section, click New organization.
Follow the prompts to create your organization. For more information about the plans available for your team, see "GitHub's products."