The above diagram shows the areas within a page that you can modify using Web Site Manager.

Site Map
The optional site map displays the "sections" that are in the site.  A site can be defined to have a hierarchical structure of sections.  A section has its own layout of gadgets, can have its own properties different than other sections such as its own banner image, secondary image, etc.  You may want to organize your site content in different sections (such as Sports, Business, etc).  The home page itself is considered a section.

Banner Area
The banner area may can be configured to have several different elements such as the banner image, secondary image, etc. 

Banner Image
An optional image that can be displayed in the left part of the banner.  Each section may have its own optional banner image or use the home page's banner image.

Secondary Image
An optional image that can be displayed in the right part of the banner.  Each section may have its own optional secondary image or use the home page's secondary image.

Menu Bar
This is an optional menu bar that is present on every page of the site and is useful for putting links to key pages that should be accessible from any place in the site. 

Login Bar
The optional login bar is used by site administrators to access key admin functions.

Section Bar and Breadcrumbs
The optional section bar is used to display what current section is being displayed.  This along with the breadcrumbs is useful for the user to identify their location within the site.

Page SideBar 
The optional page sidebar can contain the site map and other gadgets.  Each section may have its own gadgets in the page sidebar.

Gadget, Articles
A gadget is a self-contained piece of content or functionality (such as a poll gadget) that can be "layed-out" on a page in the site.  You can create "articles" that are then displayed in gadgets.  Gadgets can be displayed with different options - such as display with border around it as shown in the above image or display without a border (show as this article you are viewing).

Page Layout
The main area of the page is available for placement of gadgets that contain your site content.  As mentioned previously, each section of the site can contain different gadgets.  The page layout refers to the area on the page available for gadget placement. 

Layout Row
Each page can have 1 or more "layout rows".  Each layout row allows up to 3 gadgets to be placed horizontally next to each other.  If you add only 1 gadget, it will take up the entire horizonal width of the page layout.  If you add 2 gadgets, the 2 gadgets will take up the entire width.

By default each section starts with 1 layout row.  You may choose to add additional layout rows if you want to format your site content to have one row take the entire width, and then the next row to have several columns of gadgets as this diagram shows.