If you feel lost in all the modern-day computing, you are not alone. Computer technological advancements and inventions are accelerating so fast that even technical professionals in the field are getting get lost too when they don't pay attention for just a few months. For years, I have been helping people around me understand how computer technology work and have inadvertently created a pile of notes, emails, messages, Facebook comments, and other online write-ups. It occurred to me that if I were to compile all the knowledge into a book, it can be given to someone who will find it useful.