Do you understand your operating system?
aurora72: You miss something the author's talked about and it's the transition from GNU/Linux to BSDI assume he/she wants to have a more understandable OS; and because the BSD's excel at that area, I guess she/he's referring to the BSD's.Windows --> Great but I still cannot understand some of its peculiarities such as unexpected crashes, sudden explorer.exe restarts.MAC OS  --> Great but I still cannot understand just why its USB connection speeds are interestingly low or why it has such an inadequate Unicode support for different FileSystems like NTFS.Linux --> All great, but I cannot figure out why there are so many different package managers out there?As for BSD, because it's structure is so well-founded there's nothing which is not understandable. Everything's got its place where you'd expect them: Ports collection under /usr/ports, and package manager is just the pkg_add command. There are no window-manager or desktop-environments pre-loaded and configured, you just chose what to do. And the kernel structure is extremely simple: You can add extra functionality to kernel easily with the Loadable Kernel Module (KLM) concept. That's it, everthing's under control.