SEO means "Search engine optimisation". It signifies a set of approaches and finest techniques aimed toward bettering the visibility of a website on search engines like google.   You specify the principal URL since the online search engine can have problems pinpointing which 1 must be the key URL.  The https://www.presta-addons-modules.com/en/seo/prestashop-seo-automatic-hreflang-tags-canonical-tags-on-all-pages.html