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Using Linux for the first time
(lemmy.sdf.org)
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
It seems your machine has 4GB of RAM, in which case you can run KDE (for example) quite comfortably and don't necessarily need a lightweight-focused desktop environment. So I'd say to go with a popular distro, as the other comment suggested, and not a niche one. Then pick the DE you like from videos/screenshots.