In any line of questioning, you can keep asking "Why?" Eventually, you just stop when you think you've learned enough. For example, you can legitimately claim you know how a car works (you put gas in, turn a key, etc) even if you're hopeless as a mechanic. You've got a different acceptable layer of abstraction than a mechanic claiming too that she knows how a car works. The inner-workings of a car engine may just be an abstract idea that you only broadly understand (something about spark plugs). The point: You can start learning really cool tech without having to shift your acceptable layer of abstraction too much. It'll be fun.