1) Header - More information about the header can be found in the "Header" section in this setup guide.

2) Billboard - A billboard image can be added to a subpage in the Pages module by selecting an available image in the "Header Image" field.

3) 3rd Tier Navigation - If a page has children links attached to it, those links will display in this area.

4) Content area - Content enterd in the pages module will display here.  This image above displays the available styles for this site (in order: h1-h6, paragraph, bullet & number lists, and blockquote)

5) Footer - More information about the footer can be found in the "Footer" section in this setup guide.