What triggers this issue?
This issue reports pages with an empty or missing <h1> HTML tag.
Why is it important?
Google uses H tags to understand the structure of the text on a page better. If your page does not have the <h1> tag, you're missing the opportunity to tell search engines more about the content on your page.
Besides, the <h1> tag serves as a headline on nearly every web page these days (and not the <title> tag).
How to fix it?
It is recommended to have unique <h1> headings on every page. Your <h1> should be consistent with your <title> but not necessarily the same.
Check the "H1" column of the report to see if the tag is empty or missing.