Blog example

The header is an header H2 because the titel of the page is the H1.
Only once the H1 must be used on a page. You can use more H2's on a page. but not too much for SEO.

Header use [H3]

• Your H1 introduces the topic your page is all about, just as a title tells a reader what a book is all about.
• The H2s are akin to book chapters, describing the main topics you’ll cover in sections of the article.
• Subsequent headers, H3s to H6s, serve as additional sub-headings within each section, just as a book chapter may be split up by multiple sub-topics.

and normal text and normal text and normal text and normal text and normal text .
and normal textand normal text and normal text and normal text and normal text and normal text and normal text and normal text and normal text and normal text 
and normal text and normal text and normal text and normal text and normal text and normal text and normal text .
and normal text and normal text and normal text .
 

and normal text and normal text and normal text and normal text and normal text and normal text and normal text and normal text and normal text .
and normal text and normal text and normal text and normal text and normal text and normal text 
and normal text and normal text and normal text and normal text .
and normal textand normal text and normal text and normal text 
and normal text and normal text and normal text and normal text and normal text and normal text and normal text and normal text .

And a Header 3 again