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Steven Parker228,038 Points
The terminology does take a bit of getting used to.
This little "semantic element summary" may help:
"a group of introductory content"
"a major section of navigation"
"the main content of the <body> of the page"
"standalone sections of content"
"self-contained pieces of content"
"content that's indirectly related to the main content of the page"
"information about the site, copyright data or related links"