When dealing with content, widgets, e.g. for text, images, Google maps, etc, come in handy. Add as many of them to your pages as you think appropriate, move them around, or edit their content.
In contrast to widgets containing and presenting their content directly, nested widgets are supposed to group other widgets together in order to make them function as a whole, or to simply arrange them nicely on the page. A tab group widget, for example, forms a tab group from the tab widgets you add to it.