Deep linking involves establishing links from other websites to the inner pages of a site, not just the homepage. This helps search engines understand the full scope of the site and rank inner pages higher. The anchor text used for links should match the keywords and content of the linked page to be relevant. Links must also come from sites in the same or related topic area to carry authority. Hiring a professional can help build links at scale more efficiently, though it's important for business owners to still understand SEO best practices like deep linking, anchor text, and link relevancy.