The document outlines 14 types of backlinks that can provide an SEO boost, including editorial backlinks, guest blogging backlinks, backlinks in business profiles, backlinks from webinars, and free-tool backlinks. It notes that search engines assess a site's value based on genuine, earned popularity rather than paid links or spammy practices like low-quality directory links. Certain backlinks like those from press releases not related to newsworthy announcements or irrelevant forums can harm SEO efforts.