Back in college my CS 201 class was on C programing and needed to use the Linux machines in the lab for the class. They were running CentOS. That was my first time using Linux. After that I starting playing around with different distros (Ubuntu and Debian mostly). Then I took a “system administration” class that was really “Linux 101” that was taught by the departments sys-admin who is a Linux Evangelist and they showed me the light. Havent owned a windows or Mac machine since (about 20 years ago now)