Here will be the Help Pages: the reference documentation we have for all pages in the administrator side. When clicking the Help button in an administrator page, you'll see that page in a pop-up. You already have an overview of those pages in the administrator, when clicking Help in the side menu and then clicking "Joomla! Help" in the main screen. 

Help pages are typically a reference type of documentation: summing up all possible options you can set on that page. By adding the Help pages here, we have the four Diátaxis categories complete:

• The explanations in the original User Guide.
• The new tutorials about content management, site building and site maintenance.
• The how-to guides about getting concrete tasks done.
• The Help pages references.