Final answer:
Jesus prepared himself for ministry by gaining theological and spiritual understanding at a young age, then began preaching a message of salvation and traveled to spread his teachings for three years.
Step-by-step explanation:
According to the gospels, Jesus, the son of Yahweh and Mary, prepared himself for ministry by gaining theological and spiritual understanding at a young age. He debated Jewish doctrine with learned Jewish priests and devoted his life to spreading a message of salvation through seeking forgiveness from God for sins. Jesus began preaching at the age of thirty and traveled to deliver his teachings for three years. He was eventually arrested, crucified, and resurrected, and his followers continued to spread his teachings, leading to the birth of Christianity.