Categories and tags in WordPress websites are like genres in a library. Without tagging the genres of the books, everything will be kept together, confusing the readers. How does that translate to the website, you ask? Well, the users would spend hours going through the pages searching for their desired one. That’s why WordPress developers recommend adding categories and tags to the website. That makes it easier for the users to navigate to different sections and find what they are looking for. So they’ll stay on your website longer, potentially giving you some sales conversions.