The main idea in Gn 8 is that God after flooding the ground with water because of the many sins, remembered Noah and his ark and stopped the flooding. God then said he would not curse the ground again because of human beings. The first thing that happens is that after the flooding of 150 days on the earth, God remembered Noah and thought this has been enough time so he cleared the ground of its water. Next Noah released a dove and it found no food so it came back. So he waited seven days and he released the dove again but this time it came back with a plucked-off olive leaf which meant the water was no longer there. Finally God tells Noah and his family to get off the ark and to release the living creatures so they can multiply. Noah then built an altar to the Lord and offered burnt offerings of clean animals on this altar. God then smelt this and said to himself that he will never curse the ground. A life lesson we can learn from this passage is to have patience because Noah did and after 150 days of water coming down it was finally over.
"God made a wind sweep over the earth, and the waters began to subside. The fountains of the abyss and the floodgates of the sky were closed." (Gn 8: 1-2)
"He (Noah) waited yet seven days more and again released the dove from the ark. In the evening the dove came back to him, and there in its bill was a plucked-off olive leaf!" (Gn 8:10-11)
"Noah built an altar to the LORD, and choosing from every clean animal and every clean bird, he offered burnt offerings on the altar. When the LORD smelled the sweet odor, the Lord said to himself: Never again will I curse the ground because of human beings" (Gn 8: 20-21)