Have fun exploring! I just have a simple Raspberry Pi at home with a few services, after working with this stuff all the time I rarely feel like tinkering at home :D

That is not overcompensation, that is risk management 101.

No, it’s just the number of a specific signal.

https://www.man7.org/linux/man-pages/man7/signal.7.html

You cannot catch SIGKILL.

https://stackoverflow.com/questions/2541597/how-to-gracefully-handle-the-sigkill-signal-in-java/2541618#2541618

And for the full Linux experience do it at the perfect moment, such as when you’re in a lecture or customer presentation!