If you’re working on a full machine and not a virtual one you can use a tool called Ventoy[1] to make getting Linux install images onto your installation media easy. Consider setting up a separate partition to keep your files on separate from the OS partition so you don’t have to copy things around between reinstalls.
Linux Mint, Ubuntu, Arch, and Fedora are some of the most popular distros at the moment. Keep in mind that most of these offer “spins” or variants with a different desktop environment if you don’t like their flagship. I also keep an eye on elementaryOS, since they do lots of interesting work as well.