If you use multiple tags, then I believe that all assigned tags will work in the permalink. In other words, your article will have multiple permalinks. There will be one primary link (likely the first assigned tag) that is generated automatically from index and category pages. But the other tags should work in the permalink structure as well. My concern is that this might lead to duplicate content in Google and other search engines. To avoid that you might want to leave the tag out of the permalink.

Now, it seems it would make more sense (from a search engine) point of view to have the tag displayed in the permalink rather than the category. However there are usually multiple tags and the one taken by the permalink is not necessarily the most appropriate and moreover categories seems more organized anyway.

What are your thoughts on this?

Thanks

Permalinks is one of those things that used to be a lot harder in older versions of WordPress. These days, you just need to make sure that the application has permission to write to the .htaccess file. When you update the permalinks settings in the WordPress administrator, the mod_rewrite settings will automatically be written to your .htaccess file.

If the application doesn’t have permission to write to .htaccess you should see a message to that effect when you change your permalink structure. The message will also include the lines that should be added to your .htaccess file. Just cut and paste.