What is a heading tag?

Heading tags (H1, H2, H3 etc.) are used to organize and designate the most important parts of a web page. They are one of the most significant on-page factors in terms of SEO. The H1 tag should be used once per page, as close to the top as possible, to designate the main theme. The H2’s are used to designate specific sections of the page and can be used several times as needed. H3’s, and up are less important but still can be used to designate important parts within each section.