To break from the trend (because I recommend Mint as well),
Check out the options on distrowatch.com, test out any live distros you can. When you have some understanding of GRUB then dual boot, and then triple.
Inevitably, you're going to end up using Arch because it's so easily managed and you get to choose each component. But it's better if you have experience with the different components first. I completely missed out on learning RPM (package manager), I went from Mint (apt) to Arch (pacman). I did resurrect a lot of old laptops and desktops with various different distros though, and I learned Gnome and xfce, LXDE, MATE, and i3, xmonad..
There's a lot to learn but it's all fun, and it's all different. When you go to a tiling window manager, you'll understand why Windows adopted (albeit shittily) tiling in it's latest version.