How to Use Tags with WordPress Content
Tagging your WordPress posts with micro-keywords, or tags, helps drill down related content, which is good for search engine optimization (SEO) purposes. Tags on WordPress posts also provide additional navigation pieces for your readers to find relevant content on your site.
Tags are not to be confused with categories, but a lot of people do confuse them. Tags are clickable, comma-separated keywords that help you micro-categorize a post by defining the topics in it.
Unlike WordPress categories, tags do not have a hierarchy; there are no parent tags and child tags. If you write a post about your dog, for example, you can put that post in the Pets category, but you can also add some specific tags that let you get a whole lot more specific, such as poodle, small dogs. If someone clicks your poodle tag, he finds all the posts you’ve ever made that contain the poodle tag.
Another reason to use tags: Search-engine spiders harvest tags when they crawl your site, so tags help other people find your site when they search for specific words.
You can manage your tags in the WordPress Dashboard by choosing Pages→Tags. The Tags page opens where you can view, edit, delete, and add new tags.