About autonomous learning system package some experience and questions

Some time ago, through my own online video to learn how the zero-based packaging system, it is non-IT professional, non IT infrastructure, but will learn the relevant IT technology as an amateur interest. Sometimes for a small problem, the whole network to find the answer: Baidu, a song, and many other technical forums. After Driven by interests, I do engage in continuous east-west still learned some fur, but IT heavyweights is relative, these go far enough. We reviewed what the learning process, learning at least most of the time is very boring, because the sorts of things delayed, interrupted several times during, after a month of efforts, the packaging system finally be learned. The middle of quite a few detours, not only the virtual machine a number of problems, physical machine but also out of the question need to reinstall the system. But after we solve these problems, not only feel comfortable with the basics of some of the operating system, but also to promote some common sense, so, I think, to solve a variety of problems easier to learn a lot of knowledge, but also to finally get resolved a certain sense of accomplishment.
But for some of the problems still can not understand:
how the system works package of
how the operating system is enclosed software you want