1."GNU is an extensive collection of free software (383 packages as of January 2022), which can be used as an operating system or can be used in parts with other operating systems. The use of the completed GNU tools led to the family of operating systems popularly known as Linux. Most of GNU is licensed under the GNU Project's own General Public License (GPL)." (Wikipedia: GNU, 10.7.22 UTC 23:37)
2. "Copyleft is the legal technique of granting certain freedoms over copies of copyrighted works with the requirement that the same rights be preserved in derivative works... Notable copyleft licenses include the GNU Public License..." (Wikipedia: Copyleft, 11.11.22 UTC 00:46)
3. "GNU is a recursive acronym for 'GNU's Not Unix!', chosen because GNU's design is Unix-like, but differs from Unix by being free software and containing no Unix code." (Wikipedia: GNU, 10.7.22 UTC 23:37)
4. "Development of the GNU operating system was initiated by Richard Stallman while he worked at MIT Artificial Intelligence Laboratory. It was called the GNU Project, and was publicly announced on September 27, 1983..." (Wikipedia: GNU, 10.7.22 UTC 23:37)
5. "[The GNU Project's] goal is to give computer users freedom and control in their use of their computers and computing devices by collaboratively developing and publishing software that gives everyone the rights to freely run the software, copy and distribute it, study it, and modify it." (Wikipedia: GNU Project, 11.11.22 UTC 14:50)
6. "The Linux kernel is a free and open-source, monolithic modular, multitasking, Unix-like operating system kernel. It was originally authored in 1991 by Linus Torvalds..." (Wikipedia: Linux kernel, 11.9.22 UTC 23:59)
7. "Reasons to change from other operating systems to Linux include better system stability, better malware protection, low or no cost, that most distributions come complete with application software and hardware drivers, simplified updates for all installed software, free software licensing, availability of application repositories and access to the source code." (Wikipedia: Linux adoption, 11.4.22 UTC 18:33)
