If you've been developing WordPress websites for several years, there's a good chance you've spent a lot of time working with files like: header.php footer.php single.php page.php archive.php functions.php That's certainly where most of my WordPress development experience has been. But WordPress has been changing. With the Block Editor, Site Editor, block themes, patterns, and theme.json , WordPress now offers a very different approach to theme development. So I decid...