Linux From Scratch is a series of (online) books that walk you through building up your own linux system from the ground up, from compiling the kernel to all the individual systems that turn the kernel into a functional OS.
It’s meant to be an educational tool to help people learn about what goes into making a Linux distribution and give you better knowledge of how to build software from source. Some people turn these systems into their own distributions or personal (I guess gentoo-like?) Linux installs
articles for windows problems: here’s a virus, it’ll fix everything. enjoy!
articles for mac problems: this software fixes your exact issue in 2 clicks but it costs $50 and will never be integrated into MacOS officially
articles for linux issues: you have to sift through forums still styled like it’s 2005 but someone will post 3 lines of terminal commands that will either fix your issue or brick your system