HTML Headings are used to specify the title/subtitles of the document or a document section,
HTML Headings are by-default bold & Browsers add margins to heading tags.
HTML have 6 levels of heading , starts from <h1> to <h6>.<h1> is the most important & the least important is <h6>.
HTML Headings are block level element.
<h1>Heading 1</h1>
<h2>Heading 2</h2>
<h3>Heading 3</h3>
<h4>Heading 4</h4>
<h5>Heading 5</h5>
<h6>Heading 6</h6>
Example:
<html>
<head>
</head>
<body>
<h1>Heading 1</h1>
<h2>Heading 2</h2>
<h3>Heading 3</h3>
<h4>Heading 4</h4>
<h5>Heading 5</h5>
<h6>Heading 6</h6>
</body>
</html>