You specify the primary URL because the online search engine could have issues determining which a single must be the first URL.  The subsequent tutorial will teach you how you can enable Canonical URLs in Prestashop one.5. Rel=canonical must only surface from the of the document. A canonical tag https://addons.prestashop.com/es/seo-posicionamiento-buscadores/31857-google-rich-snippets-automatico-json-ld-opengraph-seo.html