Using conflicting or contradictory tags on the web site. You must generally use steady and coherent tags in your web site. For example, you should not use and on a similar web site. This may confuse search engines and should trigger them to disregard or penalize your website page. In https://prestashop-vs-woocommerce79900.wikikali.com/756104/the_smart_trick_of_balises_hreflang_automatiques_et_balises_canoniques_seo_that_nobody_is_discussing