Many religious people in the world believe that the name Lucifer was given in the Bible for Satan. However, the name Lucifer is actually used in Isaiah 14:12 for the king of Babylon.
The word Lucifer is a Latin word used to translate the Hebrew word for morning star. The word was first used for Satan by Tertullian and Origen, but it did not become common as a name for Satan until Milton used it in his Paradise Lost. After Paradise Lost became popular, many people started believing that Lucifer was actually a name given in the Bible for Satan.
The king of Babylon was compared to the morning star. All of those hearing Isaiah’s prophecy would understand this comparison. There was an ancient Canaanite story regarding the morning star. According to the story, the morning star desired to become king of the mountain of the gods in the north. The morning star wanted the highest place of the highest god and wanted to be ruler of the world. He was defeated in his attempt and was thrown down to the underworld.
This is what Isaiah was saying would happen to the king of Babylon. He desired to be the greatest of all kings on earth. He even considered himself as high as God, but he discovered that God is more powerful.
Do not be like the king of Babylon. Do not think too highly of yourself. Be humble no matter how important you may become in this world.
Study your Bible. Learn to serve God, and if any of this is hard to understand, ask an adult to help you.