Learning how to use other Docker images to run Docker containers is an important first step in that process.
I’m a programmer. My foray into learning how to containerize applications started by learning how to run containerized applications. Honestly, running them is the more complicated part (for many cases, some are dead simple).
Turning an app into an image is sometimes just a simple two line Dockerfile.
I started learning with Home Assistant and the branched out to pi hole, Frigate, Mosquito, and other home automation tools. I used that knowledge to containerize a home automation tool I wrote myself.
And now I’m working on containerizing dozens of applications at work.