You specify the primary URL since the search engine could have problems identifying which 1 should be the key URL.  The subsequent tutorial will show you how you can help Canonical URLs in Prestashop 1.five. Canonical URLs are made use of in order to avoid replicate content and to https://addons.prestashop.com/fr/seo-referencement-naturel/31857-seo-automatique-google-rich-snippets-json-ld-open-graph.html