The List Of Common Mistakes That Do Your Website No Good
Many site owners neglect the H1 heading because they cannot fit it into the page design. Multiple H1 headings or absence of hierarchy are most often encountered because it is easier to highlight the heading with a tag and target the visible result than style it for the same visual effect. That is, they misuse the available tools.
The H1-H6 headers should only be used to structure the main content of the page and should not be used to highlight individual blocks, block headers, or menu items.
It is allowed to use several headings H2-H6 on one page of the site and only one H1 heading. In this case, the H1 heading on each page must be unique within site.
To make it easier – imagine that this is a textbook. You should have a table of contents, sections, paragraphs.