The advanced page allows for control over all four columns of the page. There are no restriction about having the left-most column reserved for navigation as there are on the basic pages. In order to achieve columns on an advanced page, layouts must be used.
Advanced pages are often used for the home page because they allow for a much more dynamic page. Since advanced pages are significantly more complicated than basic pages, it is recommended that only advanced users that are comfortable with Cascade work with them. If the rich text field is filled out and a widget is also selected on the same row, then the widget will override and the text will not be shown.