https://www.maketecheasier.com/assets/uploads/2020/08/debian-install-set-password.png.webp
Third paragraph. I’m not trying to be a smart-ass, I also installed Debian a few times without seeing it.
Why would anyone continue reading after “you need a password for root”? You just the rest of the paragraph is gonna be ramblings about what constitutes a good password and so on. And it is exactly that and then at the very end they tell you about sudo. No wonder I always missed it.