Welcome to the Linux community! To get yourself familiar with the operating system (whichever distro you choose), I would start looking at basic terminal commands that can help you in several situations. Later on, you can explore different distros and DEs (don't distro-hop on your machine, it takes a lot of time! Use quickemu) and package managers (snap, flatpak, appimage, native ones, etc.), moving to more exotic concepts like immutable distros and filesystems (btrfs, zfs, etc.). Welcome to the rabbit hole, down we go!