Headings are defined with the <h1> to <h6> tags.
<h1>Heading h1</h1> <h2>Heading h2</h2> <h3>Heading h3</h3> <h4>Heading h4</h4> <h5>Heading h5</h5> <h6>Heading h6</h6>

Heading h1

Heading h2

Heading h3

Heading h4

Heading h5
Heading h6
Use HTML headings for headings only.
Don't use headings to make text BIG or bold. Textformatting should be done with CSS. header
The HTML <head> element has nothing to do with HTML headings.
The HTML <head> element contains meta data. Meta data are not displayed. The HTML <head> element is placed between the <html> tag and the <body> tag. Tag Description <html> Defines an HTML document <body> Defines the document's body <head> Defines the document's head element <h1> to <h6> Defines HTML headings <hr>
HTML Horizontal Rules The <hr> tag creates a horizontal line in an HTML page.
Html5 tags