article represents an article of any kind. That is, news reports, forum posts or blog posts (title, time, author, etc. related to the article)
aside is a complete block of content independent of the body of the page. For example, a note bar that contains content or links related to the main article
Figure , Figcaption represents an illustration. Figcaption is a callout, figure figcaption and an img that inserts a picture. Pictures and graphs are associated
footer represents the footer at the bottom of the page. HTML5 regulations, can only include the copyright notice, simple links and so on. When the footer is large, it should be included with elements such as Div, and then footer contains only a section of copyright
Header Enhanced class header, which can contain HTML headings and other content. Other content is a title, such as logo, author's signature, etc. This label is more widely used than footer
Nav represents an important set of links in a page. Usually only one, but can also contain multiple Nav
A section represents a chunk, or a set of documents, in a document. The content starts with a title and is used when article and aside are not applicable
main represents the topic in the page. One page only, typically used to contain article, to isolate headers, footers, and sidebar
HTML5 New Layout Labels