Block-Level Elements:

These elements begins on a new line and takes up the whole width of the browser.
The following are HTML elements that are displayed as a block.

Paragraph Element : <p>.. </p>

This is a paragraph element

Heading Element <h4> ... </h4>

This is a Heading Level 4

DIV element: <div>... </div>
This is a div element

HTML5 Structural Element
Header element: <header> ... </header>
This where the document headings go

Nav Element: <nav> ... </nav>
This tag is for the main content of the document

Click here to learn about Inline Elements.