H1-H6 headings are used for creating page structure - they indicate the importance of contents. H1 is the most important heading, mostly used for post titles, item names etc. 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 headings.
Serpstat inspects pages for two major errors:
- missing H1 headings;
- invalid heading nesting.
For details on the found errors, please expand the tab and click on More details.