Instance: You may have an e-commerce Web-site with product pages for different sizes of a particular t-shirt. You specify the key URL as the online search engine might have issues analyzing which one particular need to be the primary URL. The subsequent tutorial will explain to you the best https://www.presta-addons-modules.com/en/seo/prestashop-seo-automatic-hreflang-tags-canonical-tags-on-all-pages.html