Header - element represents a container for introductory content or a set of navigational links. A header element typically contains: one or more heading elements logo or icon.
Body - the body tag defines the document's body. The body element contains all the contents of an HTML document, such as text, hyperlinks, images, tables, lists, etc.
Sidebar - a sidebar is a user interface element that displays a list of choices. It typically appears as a column to the left of the main content, though it can appear on the right side as well.
Footer - The footer tag defines a footer for a document or section. A footer element should contain information about its containing element.
