While Luke tells the same basic story of the life of Jesus that Matthew and Mark do, he has some particular emphases. One is that Luke was a doctor, so he sometimes gives more details about medical issues and he doesn’t say bad things about doctors like the other writers do. Another is that he is writing a two-part work and so some of the things he mentions are related to the “rest of the story” in Acts.
A third emphasis of Luke is on people who were not as highly valued in the ancient world, including Samaritans, poor people, and women. He tells us more about the women in Jesus’s life than the other Gospels do. He also emphasizes that how one uses money is an indicator of one’s spiritual state. Luke also prepares the reader for how God is going to do a great work among the Gentiles in the Book of Acts.