[aos]

This is what I used when I first learning: https://serversforhackers.com/

For a really good practical project: build a website, then host it on your mini-PC and find a way to expose it to the internet. This will teach you a lot about DNS, proxying, building websites, managing the server (via some config management or container), monitoring, etc.

[rochak]

Thanks for sharing this. It is incredibly useful!

[Vampiero]

Then remember that we live in 2024 and that you need to learn how to do DevOps, not sysadmin