Systemd by Example

The about page briefly mentions Podman containers

Very neat indeed.

It says on the about page that it starts a container on demand and gives you the output.

You can see in the output that systemd detects it is running under podman.

No idea what kind of container as a service they are using, and how they secure/lock it down. Systemd is a pretty powerful system, you can make it execute pretty much anything...

How should any piece of software be taught if not by example?

Sounds like an admin friend of mine who shoots himself into the foot with his alternative init systems constantly and complains about systemd all the time — and if you ask him it becomes clear he never bothered to read up on how to use it properly.

Meanwhile I have never had a single problem with it — including with complicated microservice structures, maybe because I started diving into Linux after systemd already was present everywhere?

Edit: I want to add that I am aware of the unfortunate way in which systemd was introduced and I am not too symphatetic towards Lennart Poettering, but that doesn't change that I had no troubles with systemd. Pulseaudio on the other hand...

I don't think it's needed. I learned how to use systemd just fine without it.