Any Linux users on the forum?

I recently re-purposed my old desktop and installed Linux on it. Been curious for years. Now that I want to know more about network security, Kali Linux is one of the main tools, so no time like the present.

I know there are probably an unlimited number of Linux distros and forks. Just wondering if anyone else runs Linux either on their every day computer, or as a hobby. And if you've always run it, or started with another OS.