The preface is that part at the beginning of a book that you skip over to get to the good stuff, right? Sure, you can skip over it if you want (hey, you’re the one turning the pages), but who knows what you might miss.... It’s not very long, so maybe you should give it a look, just in case.
Very simply, programming means telling a computer to do something. Computers are dumb machines. They don’t know how to do anything. You have to tell them everything, and you have to get all the details right.
But if you give them the right instructions, they can do many wonderful and amazing things.