In my opinion, it's important to first understand how Bitcoin mining works and what role the hash plays in that process. You can see, miners trying to solve complex mathematical problems, and the first one to do so successfully gets to add a new block to the blockchain, earning themselves a reward in the form of new Bitcoins.
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Folks, just how many times must it be said that BTC mining is NOT "solving complex mathematical problems". Decrypting sha256 is NOT a complex problem - it is a simple and very straightforward brute-forcing of a solution by substituting values applied to the
fixed mathematical process: apply a number to the process, see if works and report yes or no. If no, increment the value and try again. Repeat billions/trillions of times per second until new work is received (most often the case) or 1 core in 1 chip in your miner gets lucky and finds the correct hash.