Slackware wasn't the first Linux distro, but it's the oldest still alive and kicking
(www.theregister.com)
Slackware 10.1 was my first time taking Linux out on the town. Had IBM Thinkpad T23. Thought I was pretty hot stuff. I still have massive respect for the project. They’re one of, if maybe the only, Linux distro out there that comes close to the quality of documentation as FreeBSD and because of that they’re the only distro that still feels like I think Unix felt like, or should feel like… idk maybe that’s nostalgia speaking…