You specify the main URL since the online search engine can have issue analyzing which one particular needs to be the first URL.  The subsequent tutorial will explain to you how to permit Canonical URLs in Prestashop 1.5. Canonical URLs are made use of in order to avoid replicate https://bookmark-vip.com/story18835027/the-single-best-strategy-to-use-for-etiquetas-autom%C3%A1ticas-hreflang-canonical-etiquetas-seo