I have been remodelling my web page today, installing the latest version of Wordpress, and testing out a new theme and organisational structure. I have been using categories for a while in my blog, but have not used the tags feature because I didn’t really understand the difference before I read this: Categories can be tags, sure, but not all categories are tags, and not all tags should be categories. I think of categories as a table of contents and tags as the index page of a book.