These elements (h1,h2,h3,h4,h5,h6) are for headers. They add titles to various sections of the page.
Headers should be used logically. They are not to make text big, and you should not use the wrong header just because the text will be your preferred size. Use CSS to control the size.
<h1> should be the page title, and arguably should appear only once. The
<h2> elements should be the sub-headings of the document title. The
<h3> elements are the sub-sub-headings, with
<h4> elements as their children (followed by
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