I’m a Linux mint user for my main system and am no beginner. As others have said, it’s friendly to both beginners and advanced users, it’s good to see you’ve made that choice.
That being said, don’t stop there. Whether it’s in a virtual machine or some old laptop, also try one of the “from scratch” systems. I went with Gentoo and that is the root of where a ton of my Linux knowledge started. It’s my favorite distro simply because it has that history for me. You’ll find everyone has their own favorites for their own reasons, so be sure to explore and find the one that you enjoy and helps you learn.