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

In this chat summary of the core performance team they discuss the impact of loading translations. I had no idea of the performance impact, but it makes sense

I wonder that their possible solutions have no mention on the future Guteberg stage, though maybe that is too far in the future for consideration?

Bricks 1.8.4 has been released. One cool new features is the Bricks Elements Conditions API. You can use it to do display condition filtering sever-side so that elements are not included in the frontend output, which is good for membership and other sites where content needs to be restricted.

Information about the WordPress playground, with tips and links to resources on how to use it.

This article on WordPress code reviews is good if you are working with a team, but also has a lot of good points even if you are working solo.

There are a lot of advantages to using even the free version of CloudFlare. This is a good walk-through of how to setup the free tier or Cloudflare for a WordPress website.

Justin Tadlock released a new plugin for displaying breadcrumbs. The intent is that the block can be used in the Site Editor when making theme templates. Here is a discussion and walk-through.

This is an advanced topic – How to signup for and setup Amazon SES for sending WordPress emails.

This step by step tutorial shows how to create related Custom Post Types and display related Custom Post Type information using Meta Box and Bricks.