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The Hardest of All
(lemmygrad.ml)
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
Lfs but you learn a ton.
This right here: Linux From Scratch (LFS).
If your goal is to learn, there is no better way than retrieving each tool individually and compiling it from the bottom up. LFS is Gentoo ... without all the ease of use built in. More accurately, LFS is a just a set of instructions for where to go to get the code and how to compile everything you need to build a Linux system from the bottom up.
I don't live in the world of LFS or Gentoo, but my foray into LFS gave me a much greater appreciation for the distribution(s) I do use as daily drivers. I greatly appreciate my distribution maintainers.