Illustration: You've got an e-commerce Internet site with item internet pages for various measurements of a certain t-shirt. Eight fields are available by default, and every is accompanied by a list of obtainable keywords. Some key terms are obligatory and therefore are indicated having a "*". An very good illustration https://www.presta-addons-modules.com/en/seo/prestashop-seo-automatic-hreflang-tags-canonical-tags-on-all-pages.html