The main content is entered into the "Full text" and "Image" fields and will be displayed on this page (although the abstract information could also be displayed using a custom element display).
The abstract and thumbnail image can be shown on other pages by using the List of Element Types element. The "Products" menu on this page is an example of how to use this element to display content from other pages. The items listed in this menu could have been a generated dynamically (based on specified criteria) or manually selected.
The "News" menu on this page is a List of Text Links element used to manually specify the news pages to display in this menu.