The main important event in Gn 9:1-29 is that God has made a promise with Noah that the water will never kill humans again how they did then.The first thing that happens is that God blessed Noah and his sons telling them to be fertile.Next he makes a promise to Noah and all the humans that this flood to eradicate humans will ever happen again. Finally he told them how they know it is all over, which is when they see the bow in the sky.A life lesson we can learn from this passage is that we should trust god.
"Be fertile and multiply and fill the earth." (Gn 9:1)
"God said to Noah and to his sons with him: See, I am now establishing my covenant with you and your descendant after you." (Gn 9:8-9)
"When I bring clouds over the Earth, and the bow appears in the clouds, I will remember the covenant between me and you and every living creature." (Gn 9:14-15)