Since the categories and tags makes the duplicate issues, I need to learn how to handle a canonical URL. I am running a deal site and the categories will be my main landing page on SERP. For example - I published a product with url - http://www.google.com/url?q=http%3A%2F%2Fwww.example.com%2Fthe-best-mobile-phone&sa=D&sntz=1&usg=AFQjCNF_YMeLmBVSTiS3oC2MKXBOXNw9Qw And I included that URL in more than 2 categories that are: http://www.example.com/electronics http://www.example.com/smartphones http://www.example.com/samsung-mobiles http://www.example.com/top-10-smartphones-to-buy (This will be my landing page on SERP) I may sound dumb or stupid, please correct me if I'm wrong here. I added the canonical URL in that product page (with yoast seo plugin ) pointing to http://www.example.com/top-10-smartphones-to-buy. Is this correct? Please let me know if it's right.