THE HELP! FILES: LAYOUT
The page titles of your website are structured by using heading tags such as Heading 1 (H1), H2, H3,and H4. Normally, as the heading number gets bigger, the font gets smaller. These heading tags are important as search engine spiders read HTML, and they understand the relevance of heading tags. Some templates already use Heading 1 (H1) tags in the theme’s page title. In this case you should start your heading titles at h2 and continue with h3, h4, etc. Ask us if you are not sure – as it is important not to have two H1 tags.
If you tend to write long pages, using headings can separate the sections, announce a change in subject or just add a little artistic “space” or graphic element. Note: your Theme may or may not include h3 and h4 headings.
The below displays what the different title headings look like. Again, as the heading number gets bigger (eg, h4 title), the font gets smaller: