After the flood, Noah and his family gave thanks to the Lord with offerings as the Lord has saved them. God smelled the fragrance and was happy! He promised then to not destroy the earth with a flood again; He will see the rainbow and remember the covenant He made with us.
God has a perfect divine plan and destiny for each of our lives. He will guide us every step of the way to fulfil this divine destiny. Hence, we can simply place our trust in Him as we walk towards the plans that He has in store for each of us.