I use Opencart as my shopping cart and each product has 3 different way to access and it seems to be 3 duplicate content , theses pages are the same product :
example.com/iphone12
example.com/cellphone/iphone12
example.com/apple/iphone12
how to tel google that these are the same product and are not duplicate content? (every three URLs generate in sitemap.xml seperately)
I should use the canonical link in my each 3 pages head .
more details here