The second letter from Peter is found in the New Testament of the Bible. Peter was a leader of the church. He sent this letter to all believers.
Peter told the Christians how they could grow as Christians. He explained that God himself directed the authors of the Bible (2 Peter 1:20-21). Peter warned the Christians about evil teachers. These teachers were teaching false ideas. And their behaviour was very evil. God will punish such teachers. And he will also punish the people who follow them.
Peter also explained about Jesus' return to this earth. Some people might suppose that Jesus will never return. But Peter explained that they are wrong. God made the earth. And God will also destroy the earth. God is not slow; but God is patient. And, because God is patient, we have the opportunity to trust God now. Then, we will enjoy the things that God promises: a new heaven, and a new earth.