I often feel like I'm still relatively new to the #POSIX world ( #Unix and #Linux ).
In 1988, I started using Unix at IBM (as AIX) on its RT workstations. In 1999, learned C programming on a #Sequent minicomputer. In 2001, I bought an iMac with OS X (BSD), and installed X windows to run OpenOffice.
I started experimenting with Linux when I still had to download and compile source code, and dabbled with #Fedora . (I recently noticed an old copy of Fedora 10.) I got into #Ubuntu around 2010. This year, I installed and already like the new #FedordaWorkstation39 , upon which I've been running #KiCAD (and a bunch of other stuff) with nice results.
It seems like there's always something new to learn about computers.