Roles control what features a member has access to in a workspace. Workspace Owners and Org Workspace Admins can assign roles to workspace members to set what members can do. Roles are unique to each workspace–if you belong to multiple workspaces, you’ll have a role for each workspace you belong to.
To collaborate in real time, all users must have permission to access your document. Each permission level - owner, editor, or viewer - gives collaborators a certain amount of access to edit or interact with your file.
Overview of Permissions - Video
Update File Permissions - Video
Set Permissions in Home - Video
Advanced Permissions - Video