When you edit a page, there are actually five sections that you can make changes to that will effect the item you are editing.
The main screen with the WYSIWYG editor built in
Allows you to assign tags to this item
Choose an effective date to make the content available or an expiration date when the content will no longer be publicly avialable
Lets you assign this content to users or groups to edit.
This includes a checkbox that allows you to exclude this item from navigation