Just to add, don't forget you can create live CDs/USBs to dip your toes with other distros to try and experiment without mucking up the system. Especially Ubuntu-based derivatives (such as elementary OS and Linux Mint, plus official flavours) where they are very similar under the hood to Debian (think apt-get), but come with a different feel and objective. Only distros like openSUSE, CentOS and Fedora is where Linux is shaped differently (eg. yum for package management), while the interface may look familiar (GNOME/MATE/KDE).
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