A HTML heading or HTML h tag can be defined as a title or a subtitle which you want to display on the webpage. When you place the text within the heading tags <h1>...</h1>, it is displayed on the browser in the bold format and size of the text depends on the number of heading.
There are six different HTML headings which are defined with the <h1> to <h6> tags.
Note that theh1 tag is only used once, as the main heading of the page. h2 to h6, however, can be used as often as desired, but they should always be used in order, as they were intended. For example, an h4 should be a sub-heading of an h3, which should be a sub-heading of an h2.
h1 is the largest heading tag and h6 is the smallest one. So h1 is used for most important heading and h6 is used for least important
<h1>This is heading 1</h1> <h2>This is heading 2</h2> <h3>This is heading 3</h3> <h4>This is heading 4</h4> <h5>This is heading 5</h5> <h6>This is heading 6</h6>Try it with the Editor