What is the use of H1, H2, H3, H4, H5, H6?

 H1, H2, H3, H4, H5, H6 tags are used to define Heading on a web content.

The H1 tag should only be 1 tag, and the strongest tag generates page-by-page content, and is of interest to the search engine when it comes to your page.

The h2 to h6 tags can be used many times, but should use a maximum of 3 for the h2 tag, and 7 for the h3 tag, and 16 for the h4 tag. The number of cards may increase gradually, but not so much that you overuse the heading tags, as in my experience, you only use the h4 card level in the page or any article. brain. And also depending on the content of that page is long or short that we consider adding these tags.