In the first stage of the development of the gospels which is Jesus’ existence and his life. The elements of this stage is the events of the life of Jesus such as his baptism in the river Jordan, his miracles and his death and resurrection.
The second stage of the development of the gospels what is the oral tradition, the elements of the stage was the disciples preaching about Jesus telling his stories and talking about his miracles.
The third stage of the development of the gospel is that it has been passed down through generations by written record passed from one generation to another
Jesus use parables and stories to teachers followers as of the time people comprehend things based on word-of-mouth, and stories and parables were taught early at the time