H1-H6 headings are used for creating page structure, and each heading indicates the importance of content which comes after the tag. H1 is used to denote the most important heading, for instance the post title. H6 is the least important heading.
Every page should have only one H1 heading, while each H1 heading should be unique within the site. You have to keep the valid ordering of heading tags.
Serpstat’s checks pages for two major errors:
- missing H1 heading
- invalid ordering of heading tags