There are two main node types for content right now:

• basic pages
  • View pages of this type
  • Edit this content type
• authenticated content
  • View pages of this type
  • Edit this content type

Basic pages are publicly accessible.

Authenticated content are pages that you must log into the Drupal site to view.

You cannot automatically convert one to the other but you can copy content from one to another and then delete the old one.

Technical note for developers:

• This is achieved with drupal/access_by_taxonomy
• The authenticated content type is a page that automatically gets tagged from the "Access Control Tags" taxonomy with the tag "Authenticated Users"