When the Buddha became "enlightened", he found the answer to "suffering", and he knew how to defeat "suffering". This answer was called the Four Noble Truths. He was not sure if he should teach his new ideas or not. He asked himself if the world was ready for such a deep teaching. But in the end, he decided to travel to a town called Sarnath to teach the people his new way. He taught about the Four Noble Truths and the Noble Eightfold Path. The people listened to him.