Summary Card - is intended to provide the reader a preview of the material in advance of clicking by means of to your website. For those who operate a website with content material in the form of tutorials or explanations of any sort – you need to think about using https://www.presta-addons-modules.com/en/opencart-seo-automatic-google-rich-snippets-json-ld-integration-opengraph-twitter-tags-schemaorg.html