This issue has been bugging me for a while, so I decide to ask here: I have a website that currently has a brand category (i.e Nike, Puma, Adidas, etc.), but I also want to create a category for men's shoes, women's shoes, and kid's shoes. Now, suppose I have a review article about a Nike shoes for men. Is it okay for the article to be under two categories, SEO-wise? What would be a good way to deal with this? Personally, I don't think it's a good idea, but I also want to hear from more experienced people in the forum. Any suggestion is greatly appreciated. Thanks!