My recommendations
H1 tag - one per page used as the content heading.
H2 or H3 tag - use below h1 to give headings (intros) to new paragraphs.
---------------- example -----------------
Logo goes here
Nav goes here
H1 goes here
Paragraph goes here:Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.
H2 goes here
Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.
----------------- end example -------------------
Only use 1 H1 tag per page, at the very top of content after logo and main nav. If your using a web template purchased/ freely downloaded check the code, so many web designers overlook it, an example would be wrapping the logo in a H1.
The H1 is the page descriptive page title, very important for seo. make it user readable friendly, do not keyword stuff it.
Hope that helps.