How do I share a specific folder or file with another user in SharePoint?

Note: You must be the administrator of a Sharepoint site to edit the access of other users.

Choose the appropriate option:

• How do I set permissions on a document library in SharePoint so only certain people can access it?
• How do I set permissions on a particular folder within a document library in SharePoint?
• How do I set permissions on an individual file within a document library in SharePoint?