Well, I wouldn't know if it's a good choice.
Well, I just told you it is a good choice.
General consensus around Linux .org and indeed any Linux forum is that anything that is based on Debian is going to have the same attributes as its parent. Reliable and stable.
In fact I'm somewhat concerned about wasting my time learning an obsolete system. Is there a particular version of Linux you recommend for beginners?
LMDE (linux mint debian edition) is one of them. Your ability to make an unspecified mistake does not necessarily equal an obsolete system. Far from it in fact.
As for recommendations: LMDE7 & Linux Mint 22.3 are among them. It is largely a matter of taste. Ubuntu would also be included in the list: keep in mind there are close to 500 Linux distros. You will find a list at:
https://distrowatch.com/
A great number of potential users also load a usb with
Ventoy. This enables them, to load various distros of their choice, up to the capacity of that usb, and they are then able to boot to the different distros until they find one that suits them.
That leaves the question what I did to break it
No idea. I have run Linux mint for the past 13 years, and was under the impression I had broken it every way possible.
I have never broken the terminal.
I also run LMDE on a separate drive and have yet to ever break it.