Headings on your page are very important as they summarise the content that is on that page - as well as guiding a user through the content at a quick glance.
Search engines realise the importance of headings on a page and look for them when indexing and ranking your site.
This is, part of the work that Search Engine Optimisationencompasses,is making sure that heading tags are applied properly in your page content.
The tags that need to be utilised are the Heading 1 - Heading 6 tags.
Heading Styles 1, 2, 3, 4, 5 or 6 -should be applied ONLYthrough the "Paragraph Drop Down Selector" (See Arrow 1 below)
NB.Please doNOT use the "Style Editor Tool"for the purpose of adding Headings 1 thru 6 - these must be applied using the "Paragraph Drop Down Selector ONLY for purposes of Search Engine Optimisation