H1
H1 tag is the highest level. There are six heading levels <H1>...</H1>, <H2>...</H2>, <H3>...</H3> <H4>...</H4>, <H5>...</H5>, <H6>...</H6> being the H1 element most important whereas H6 reprsents the lowest level. Web browsers determine the FONT, weight, and other characteristics of each H1 to H6 levels. Each heading element is rendered on its own line, with no line break or paragraph elements necessary to begin the content. Fonts, weight, color and other characteristics can be changed using CSS rules. For Example:
<H1>Search Engine Optimization</H1>
<P>SEO helps in high ranking on search engine result pages</P>
<H2>Search Engine Marketing</H2>
<P>PPC ads or banners are the most common way of marketing</P>
<H3>Web Design</H3>
<P>You need to plan how your website should be</P>
<H4>SEO</H4>
<P>SEO is also known as Search Engine Optimizers</P>
<H5>SEM</H5>
<P>SEO is also known as Search Engine Marketers</P>
<H6>Sarvpratham</H6>
<P>You are visiting Sarvpratham's website</P>