# Why-What-How If you want to know something, you should know Why-What-How. "Why I need it?" - "What exactly is it?" - "How can I use it?". Those are strongly related. If you know why you need it, you could define a definition. If you know why you need it and what exactly it is, you could know how to use it with some effort. A problem is that many people don't know Why, sometimes even What. If you only know What-How, you are a slave. At most a machinery part. It really hurts when I think about that.