Ask HN: What is the best source to learn Docker in 2023?

I know docker for a long time but I never used it in serious projects. I find it hard to find good and especially up to date tutorials. I’m especially interested in a tutorial on how to run (feature branch) containers which spin up on bitbucket pipelines/GitHub actions for manual and automated testing for PHP and Node applications (containers should exist as long as a feature branch exists). I found some random YouTubers which give a nice intro/demo into some features but not really a deep dive.