This is a good overview and tutorial for using the functions.php file.

In the not WordPress, but useful department – Here are some nice browser dev tool tips. The author of the article maintains a site with these and the ones in the article are the most popular.

Here is a nice list of WordPress plugins from Jeff Starr that are useful when developing or debugging. I’m happy to see BugFu at the top of the list as I’ve found it easy and useful.

Interested in block development – this tutorial shows how to create a dynamic block using the RestAPI and the useEntityRecords to get a listof pages. It is a complete tutorial and you should be able to create a working block by following it.

Marcus Kober has written this in depth guide for developers on how to add hooks to your PHP code.

Yikes! – Note that WordPress 6.2.1 removes support for shortcodes in block theme templates. Apparently this was part of one of the security fixes. There are a couple of work-arounds mentioned in the thread.

For the programmers in the group, WordPress 6.2 shipped with a new WP_HTML_Tag_Processor. In this video Aurooba Ahmed and Brian Coords discuss it and do a walk-through to explore its uses.

What happens behind the scenes when a WordPress page is loaded? This tutorial on the Learn WordPress site provides an overview of the page request lifecycle, from the query string to which template is used. The tutorial is high level enough for a power user to read, but has information useful for developers.