My first contact with Linux/Unix was through fli4l [1] an open source boot-from-floppy Linux router with which I shared our family’s intermittent 56k dial-up (!) links back in the day (I believe from 2000 onwards it was a single channel ISDN line; what a dream).
Then there was the famous Knoppix [2] distro; coming with many German computer magazines at least.
So yeah, all in all I’m more of a *BSD “graduate” (main reason being man pages were usually of higher quality; at the time at least) but to this day my favourite flash’n boot distro is still Debian based “headless CLI first” GRML Linux [3] (came with pre-configured zsh way before it was cool, lots of networking tools etc, a Swiss Army knife for the sysadmin).
I had been running an old underclocked PC with it as a router and for NFS - for years and only until somewhat recently.