Jehovah showed Adam and Eve one fruit tree in the garden and told them that if they ate from it, they would die.
One of the angels rebelled against God. That wicked angel is Satan the Devil.
Satan did not want Adam and Eve to obey Jehovah. So he used a serpent to tell Eve that if she ate the fruit from that tree, she would not die, but she would be like God. Of course, that was a lie.—Genesis 3:1-5.
Our world is full of beauty. It is placed at just the right distance from the sun, it is tilted at just the right angle, and it rotates at just the right speed. Why did God put so much effort into making the earth?