I am an old timer. I started with BSD before there was even a Linux. NetBSD on an Amiga 3000 before the AT&T law suite against NetBSD, then heared about Linux which was twice as clean as NetBSD and without legal issues - Later NetBSD removed all legal issues nonetheless.
First Linux was a Watch-Tower Distribution, basically a big RAM-Disk with a rudimentary Linux system which you copied to HD. No package manager, nothing. tar, make was the way to do installations. Shortly after Slackware and SuSE which basically was the same back then. Then a lot of SuSE then Debian, then Ubuntu. Don’t care much about the distribution nowadays as long as it is DEB-based.
But now something to scare all of you: Today my most used POSIX environment is… Cygwin. Well, I got a Windows-Notebook for development and a VM is really clunky in comparison to a fully integrated POSIX-layer like Cygwin. For developing Stuff it actually matters very little if you use BSD, Linux, Cygwin or even Solaris.
PopOS is a sure way of getting into ten times more problems than Ubuntu.
Seriously, I know them all. Started with NetBSD in 1991, used pretty much everything.
If your system isn’t super weird then Ubuntu is the most relaxed experience you will ever have as a newby.
(And yes, I am not using Ubuntu currently. But then, I hat 35 years of POSIX/Unix/Linux experience)