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Slackware is a Linux distribution created by Patrick Volkerding in Jul 1993. It is the oldest distro still in existence. However, someone was dissatisfied with Slackware and created another distro a month later, in August 1993. This was Debian, the second oldest distro, founded by Ian Murdock. Both of these distros are still maintained, and Debian is often known as the "mother distro" because it has spawned many more distributions.

Softlanding Linux System (SLS) was the first distro in 1992, but it was buggy. So, it led to the creation of Slackware and Debian. I had never used SLS, so I started with Slackware.