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.
Knoppix was my gateway as well. I’d checked out Linux before, but I used Knoppix to help out regularly for a while, which led to dual booting my laptop with Ubuntu 6.06, ending with Linux being my main OS.
The first thing I tried wax knoppix but the disk my mom burned for me didn’t work, I didn’t wind up actually getting to use knoppix until high school and then I found DSL was better for my needs at the time.