Paul wrote many of the New Testament books.
In the book of Romans Paul taught the believers so that they would follow Jesus well. He wrote the two books of Corinthians so that believers there would remember what he taught about love. He also wrote to the believers in Galatians, Ephesians, Philippians, and Colossians. In Thessalonians 1 and 2 he told about Jesus' second coming. He wrote letters to these people: Timothy, Titus, and Philemon.