I've seen a lot of people who quite dislike Manjaro, and I'm not really sure why. I'm myself am not a Manjaro user, but I did use it for quite a while and enjoyed my experienced, as it felt almost ready out of the box. I'm not here to judge, just wanted to hear the opinion of the community on the matter. Thanks!
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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.
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Personally I use it when I need to spin up a medium to long term virtual machine.
It's fast to set up, it's fresher than a debian based one and you can easily "get dirty" with off the beaten path choices, if you want. Having easy access to the AUR is really a great plus too.
I would never use it as my main distro or as a real OS on the HDD, tho. For that it's just better to use Arch directly, and with the "new" installer it's relatively fast and painless too.
I feel it has its place as a middle ground for someone that wants to learn more about using linux, but who is not really ready to leave the comfort of having an opinionated preassembled experience.