Ah, 1995..
There I was, freshly recruited by the then leading UK ISP and as yet fairly unacquainted with the Net other than having used bulletin boards, set up some small networks and all sorts of other fun things that bored people with a technical inclination get up to, including a Demon Internet account which I got online after all the then magical incantations that it required (yeah, no idea what a DNS was, or what an IP address actually did - I was just following instructions to get KA9Q going). And, as yet totally unaware of the existence of Unix in general other than a brief run in with Xenix at a friend's house.
I thus get introduced to the People Who Know Stuff, and on discovering I do have a home built PC which I was happy to set up for dual boot (I still needed access to Borland's Paradox and Turbo Pascal) I was offered help to install Linux, with two statements: (1) I was to follow the internal courses for Unix sysadmin and Internet and (2) post installation, I would only get answers to "smart" questions (translated: learn to read man pages and HOWTOs). And it was exactly what I needed.
That was Slackware, on floppies, and the rest is history. I recall ordering CDs from Walnut Creek when new versions came out because Internet (and network) connectivity in those days made that a faster option than downloading (once we had CDROM drives - that came a bit later, usually via a Soundblaster card) - the fact that I can download now a full Debian DVD sized installer in mere minutes is still a source of amazement (not that I would, network installs are feasible with those speeds, but not in the days of 2400 baud :) ). It's through Linux that I learned how the Internet worked (to the point of even having manually configured sendmail.cf before someone came up with the m4 idea), and that deep knowledge serves me to this day. It's also how I learned what robust, reliable computing looks like (I've used HP UX, IMB AIX, FreeBSD, NetBSD, SunOS, Solaris and probably some other variants since), including replacing unstable NT file and print with Linux and other fun stuff like getting an uptime of over a year on a desktop to annoy the Windows server sysadmins at a later employer :).
Personally I now use a mix of MacOS, Debian and OpenSuSE, but I still very much prefer a command line to do things quickly - once you know how to work efficiently, you kinda get impatient with anything else that just gets in your way :).
Happy Birthday Slackware, and thanks for the fond memories.