Reborn in the 60S, I Want to Be the Strongest Person Born in the 50S

My brain is running out of energy, so is the male protagonist's system positioned as a fantasy, or as a futuristic technology, and there is no preface? In fantasy terms, what kind of power can create things out of thin air? If you want pigs, there will be pigs, and if you want grain, there will be grain? Since it exists out of thin air, why cultivate and breed it? In terms of technology, how much energy does void storage require? Is it cost-effective? So even if it is fictional, there must be at least a basic structure. One chapter on Becoming an Immortal Emperor is okay, although it's a bit short, at least it's clearly written? What do you think of this creation out of thin air? Is it fun?

This is a good book, you can read it