LOL, lemme explain.
1. *nix is the general encompassing nomenclature given to all operating systems based on Unix (counting both Unix-based systems and Linux-based systems).
Two. *nix technologies allow you to create your own operating system (OS from now on) with only the OS kernel written for you (but you can also modify it if you so wish).
III. Deriving a side project from a main one and continuing to develop it separate from the main project is called, in software development, "forking"; i.e. you "fork" the development road and follow along a path by yourself while the main project follows another path.
(22). "Roll-out" is developer lingo for "version".
[√25]. In layman's terms, what I said was that in the end, it's better if you just develop your own OS based on your needs and preferences, and the hardware available, since this gives you the possibility to focus only on those issues you actually want to deal with, and leave entirely out of the OS what you don't want or need.
Clear?