The main idea Gn 9 is how God blessed Noah and all of his kids and how they almost betrayed their dad Noah. That God had told Noah to gather all of the tamed animals and to save them. Also that God had told Noah that there was going to be a flood.That Noah had drunk some wine and got drunk. Then had gone to his tent and slept naked. The sons had made fun of Noah’s nakedness. Then he had cursed his son Caanan that he shall be the lowest of his sons.That not to shame others that try to do good in the world because karma would come back and get you.
"Be fertile, then, and multiply, abound on earth and subdue it"(Gn 9-7).
"Ham, the father of Canaan, saw his father's nakedness"(Gn 9-22).
"Noah lived three hundred and fifty years after the flood"(Gn 9-28).
God keeps all of his promises even if somebody didn't keep the promise