What do you mean by "the nature of reality"? Is it, for example, a "reality" that you can travel from Houston to Dallas?
Who/what created the universe (it either occured spontaneously or was created by something outside of the universe - we do not know which, but only one origin is correct).
There are obviously concrete laws of physics that govern things (what is the origin of those?), might there also be concrete laws of morality that govern humans (it appears there may be, or may not be - but only one is correct)?