Release notes. Migration to Gulp 4 and NodeJS v13 support.
A guide into automated deployments using DeployBot.
Query Monitor tracks loading times of each WordPress hook and database calls, which allows for better tracking of bottlenecks and where the code needs optimization.
Debug Toolkit makes debugging your code easier and more enjoyable. It will let you inject debugging breakpoints that will output as HTML.
WordPress offers two types of hooks, action hooks (triggers actions) and filter hooks (replaces or modifies values).