If you like to try out different flavors of Linux as well as other distros, install them in a virtual environment like VirtualBox. In this way you avoid messing up your system since installation will be inside a container. VirtualBox can run in Windows, Mac and Linux. I’m currently running it on Linux Mint 19. If you are curious, the instructions are here to install VirtualBox 6 in Linux Mint 19.
I’m thinking about using the Linux desktop again after 4 years of inactivity. The MacOS was the desktop of choice. I’ve been happy with the switch. I don’t anticipate abandoning it any time soon. Lately I thought about sharpening up my Linux skills after having been dormant for years. I need a Linux platform that I can work with. Ubuntu is my default, but there are other distros equally interesting. Mint, Debian and Fedora come to mind. Instead of having multiple boot partitions, I might install Ubuntu as the base distro and install Virtualbox. Other distros can be fired up as virtual machines. In that way, it’s simple to manage. I just need a heftier machine that can handle several VMs running at the same time. That’s the plan for the next several weeks.