Travel to the Post-Apocalyptic World

From the era of the Galaxy Federation to the new era after the end of the apocalypse who knows how many years ago. I don't have anything I want. Su Ying said that with the brain in hand, I have the world. Food? Not enough to eat? It doesn't matter, the brain will mature! Isn't it just an energy wave? Superpower? I won't. But my brain can simulate it! Isn't it just an energy wave? Science and technology? I don't. But my brain has records! Isn't it still an energy wave? What is most important in the last days? Natural energy waves!