Hi! I will say sorry if the question has been asked or posted. But I am a newbie. What confuses me is the boolean thing that I really don't understand. I am just wondering what it is used for? Is it only used for true and false? Does the expression always have to be like Not, Braces, and then OR and AND? And does the number always have to be 0 // 1 or 1 // 0 in comparison? I am just quite confused when it comes to boolean in the tutorial. If somebody is willing or cares to explain in details, I would be really grateful to that.