Break up long articles with subheads. Visitors will linger longer on your web site if a long article does not look so daunting to read. There should be a perception that they will be able to get through it quickly so ready 5 x 300 word chunks appears to register easier on the human brand than 1500 words all in one go.
Adding images and subheads makes an article visually appealing and easier to read. People linger on these pages longer.
PLUS the SEO Secret to Subheads
The other tactic you should know about subheads is that using the <H3> HTML tag or the <H2> HTML tag tells Google that the subheads help describe what the page is about. So when it is scanned by the Google bot the words in the subhead are noted. If you are trying to get the page ranked for “best dog food” then these subheads should reinforce the topic by using similar words like “kibble” and “dog chow”.