AceEngine

Header Tags
"A heading element briefly describes the topic of the section it introduces. Heading information may be used by user agents, for example, to construct a table of contents for a document automatically.

There are six levels of headings in HTML with H1 as the most important and H6 as the least. Visual browsers usually render more important headings in larger fonts than less important ones."
Definition provided by w3.org

examples:

Tip 3a: Target your audience. If you are focused on real estate in a specific area don’t waste your time trying to promote your website for a general phrase such as “real estate”. The online arena is highly competitive for real estate, to give your self a fighting chance at getting your time energy and maybe cost back out of these efforts is to focus on your niche market.