It was always very difficult for me to understand the meaning of all these widely used terms. But you simplified it by so easily demonstrating their functionality and association with the actual data input and screenshots, that it became crystal clear to grasp for me now.

One thing I wanna know: Does Nonce need to be calculated by hit and trial or is there some rule to find it? Is it this calculation of "Nonce", where all PoW computing (or hashing) power gets consumed?