Wordpress - How do I add /blog/ as a prefix to permalink structure for blog posts, tag pages, etc.?

You get 404 errors when you add "/blog/" to the custom permalink structure and then also add "/blog/" to the category base. It should only be added to one, the custom permalink structure.

If you leave your category base and tag base blank and just add "/blog/" to the front of the custom permalink structure to make it look like this "/blog/%postname% - this will get the desired result.

Your pages will look like this: domain.com/pagename/ Your post URL will look like this: domain.com/blog/postname Your category URL will look like this - domain.com/blog/category/postname

Hopefully this is useful...

Go to Settings>Permalinks and add it to the permalink structures