Then sin and evil entered into the world. God had placed Adam and Eve in a garden where they could eat from any tree they like, except one. They understood God commanded them not to eat from one specific tree but they were deceived and rebelled against God by eating from the forbidden tree.
Disobedience was bad enough, but in eating from this tree they messed with the very fabric of creation. Because of man's sin, God's wonderful universe was tarnished. For this, God cursed the snake who deceived Adam and Eve, he cursed Eve, and he cursed the ground that Adam worked. But God did not only curse, he also promised a future day when he would restore his creation, when he would make right what his human creatures had made wrong.