Subheadings can be used to create visual interest and summarise blocks of text. These must be nested correctly.
The first available heading level is H2, as H1 is used for the page title.
Levels are available to H6, though we don't recommend using too many levels - it may be better to split your content into more pages.
You must nest your headings properly, or your page will break for screenreaders. Never use a different heading style for aesthetic reasons.