For plugin developers – Ronald Huereca has a straightforward tutorial about namespaces and using them in your plugin.

For plugin developers – Plugins hosted on WordPress org have an assets folder for icons, the banner, screenshots, etc. Here is a guide for using the assets folder.

Developer focused – Tom McFarlin has another article related to using anonymous functions in WordPress. He has also created a plugin to get information about registered hooks and callbacks on a site.

For developers – This article gives and overview of the REST API and show how to create your own custom end-points.

For plugin authors – here is an in-depth and practical guide from Matt Cromwell on how to optimize your plugin’s readme file.

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.