To improve Magento seo use canonical link Meta Tag for categories. That is a configuration setting. It places  on every category page. It helps to avoid duplicate content SEO problem. By default it is turned off. I will show you how to enable this setting:   Magento 1 users   Go to System > Configuration > Catalog > Catalog > click on Search Engine Optimizations tab  and set 'Use Canonical Link Meta Tag For Categories' to Yes. Magento 1 canonical meta tag for categories   Magento 2 users   Go to Stores > Configuration > Catalog > Catalog > Search Engine Optimization tab and set Use Canonical Meta Link...