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Gentoo or LFS?
(programming.dev)
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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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I suggest LFS if you want to learn the complexity of creating a distro from scratch. (You might not succeed on the first try. I gave up multiple times before forcing myself to finish it)
I never tried Gentoo so I can't really say anything good or bad about it.
My question is: what are you expecting to learn from this? you say "learn more" but what exactly do you want to learn? Because if it's "becoming better at linux" you can definitely do it with just Arch.
If you just want something "more difficult" to install, I guess you can do it.