If you look at the bottom of this post, after the main text, you'll see that I've added tags to categorize the pages of my website. Clicking one of the links in the "Tags" section will take you to a summary page, listing all the posts with that tag.
Originally, a bug was causing the phrase "Tags: " to show up even on pages without any tags, but as of 2019-12-08 I've rewritten the code to take care of that.