You specify the primary URL since the internet search engine could have trouble analyzing which one particular should be the main URL.  The subsequent tutorial will tell you about the way to empower Canonical URLs in Prestashop one.5. You'll find three ways so as to add hreflang tags to https://addons.prestashop.com/pl/seo-pozycjonowanie-naturalne/31857-automatyczne-google-rich-snippets-json-ld-opengraph-seo.html