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COSMIC: The Road to Alpha
(blog.system76.com)
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
Not really. Best Foss projects do not always thrive. Git wasn't really better than mercurial. But it had happened to be published earlier, so it got wider adoption.
It doesn't have to be the best, it just has to be better than the current standard. Git was better than CVS and SVN, so it won.