I’d recommend MX Linux, which is a Debian based distribution that has dominated distrowatch.com for a long time for good reason. They have a bunch of management tools, newest Firefox… You might try just using it in VMWare Player (free) virtualization first, which has better 3D support than Virtualbox. I’m currently using MX Linux KDE Beta and it’s solid as they’re only tweaking some of their tools after the latest Debian release. And they have a good forum community for help. And Debian is the base from which Ubuntu and other distributions are built, and kind of the foundational Linux version which makes it a good place to learn Linux.