Here is a process overview article on the Delicious Brains blog about creating custom block using React and using ACF. It does not go into depth but links to resources for various steps.

Rich Tabor shares some thoughts on the “composability” of block themes.

Adam Lowe has shared his premium course on YouTube for free. It goes in-depth on how to create a classic theme using Pinegrow. It is a great resource on creating a classic theme and on Pinegrow.

For developers: this is an in-depth overview about WordPress nonces and a tutorial on how to use them.

This is an advanced tutorial on using the WP_Query object.

For developers: WordPress 6.1 added the “did_filter” function to check if your filter has already been run during the current page load. It is a bit esoteric, but useful if you need it.

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.