I’ll go first, I took my mom’s college textbooks which came with discs for a couple distros and failed to install RHEL before managing to get Fedora Core 4 working. The first desktop environment I used was KDE and despite trying out a few others over the years I always come back to plasma. Due to being like 12, I wanted to run my games on it, and man wine was not nearly as easy to use (or as good) as it is nowadays. So I switched back to windows until around 2015 or so when I spent the next few years trying to replace windows as much as I could. Once valve released proton, I switched fully and have t looked back, unless my still there windows partition tries to take over my computer when I restart it at least.
I think my first experience was around 1993 or 1994. I downloaded the 3.5" disks at the university and then uploaded onto my 386. No GUI, all command prompt. :).
Right around that time, too, I found some network cards and co-axial cables and 3-4 of us in the house put the cards in our computers and could see each other’s computer. Couldn’t do much else though. Hahahaha.
You could definitely play Doom!