I am usually using two categories and three tags for one content. Does that mean that I create five duplicate content each time I write an article? Of course, I used yoast seo to set no index for tags and categories. Someone told me to put the LSI keyword in the tag, and someone else told me not to use the tag. What am I supposed to do? Here are my questions. 1. If I use yoast seo and have no index of tags and categories, does that mean that I am completely free from duplicate content? In other words, if I use yoast seo to have no index of tags and categories, can I use multiple tags and categories? 2. What's the difference between tags and categories? In my opinion, both tags and categories are one way to classify my content. Also, the WP tag archive and the category archive are different from each other only by their names, and their appearance and html structure look the same. If I'm right, would it be okay to classify contents using tags instead of categories? My ultimate goal is to create an authority site. Other issues have been resolved somewhat, but I've been struggling for three days because of tags, categories, and duplicate content issues. The articles on my site are based on tips from many SEO experts. Tips for putting LSI keywords, using h2 h3 tags, writing over 500 words, using ALT tags, using bullet lists, and so on. As a result, some 'long tail keyword' articles have been ranked on page 1 but there are still a lot of things that are missing. I would like to help you solve the problem that I face. P.S. I'm sorry I do not have enough English. Please note that my target keyword is in a language other than English. This article was written with the help of a Google Translator.