Structured facts is included straight to a web page's HTML markup. Search engines use structured information to make rich snippets, which might be little pieces of information that could then seem in search results. I wouldn’t give Substantially body weight to their recommendation. They are saying that "Structured details markup https://bookmarklethq.com/story18836136/everything-about-google-rich-snippet-automatico-json-ld-open-graph-seo