No, haven’t seen parrot before, but I’m going to check it out.
To be honest - if you’re just getting into the game, pick any Linux. It doesn’t matter. Learn how to use a unix terminal. Do some shell scripting.
If you can program install php, Mariadb, and nginx and build a web app. Do it all on a Linux distro laptop and ssh into the server and build the app. It can be a pointless app. Just start doing stuff with Linux.
Once you get comfortable with Linux then pick a path. RHEL for big environments; plays well with ancible, too. For security Debian and Ubuntu aren’t bad - that’s what Kali and Parrot are forks of.
I’m going to be honest, in some areas finding someone who can just cd around a Linux terminal can be hard to find.
Personally, I use Fedora as my worststion OS, work in a Red Hat shop, but also have two Ubuntu laptops and heavily use a Macbook because it has a unix terminal and that’s all I really care about/need.