How to format the text in terms of SEO?

Question

Search Engine Optimization

There are semantic markup, html tags, etc.
How do search engines feel about the fact that, according to the HTML 5 standard, each section on the page can have its own h1?

Answer 1

SEO is not a science (like html 5) but shamanism
From the point of view of shamanism h1 should be one.

Answer 2

h1 should be as long as necessary. At least 10 in one article.