The four gospels; Matthew, Mark, Luke and John are unique in their various perspectives.
Luke was a learned physician. He compiled a variety of information via interviews with eye-witnesses. He writes his accounts addressed to Theophilus, probably to convince him that Jesus is the Messsiah.
In Luke, we learn about Mary's conception and pregnancy with Jesus, and also Elizabeth's pregnancy with John the Baptist. Further, Luke states that Mary spoke with Gabriel, an angel, and was told that she would give birth to the Son of God, Jesus the Messiah. Obedience to the law, such as Jesus' circumcision, is recorded. So is an incident where Jesus, as a young boy, stays behind in the Temple in Jerusalem talking with the Pharisees and scribes about the law.
There are several references to Jesus' fulfilling prophesy concerning the Year of Jubilee. Luke also mentions the Holy Spirit at work in many individuals surrounding the life of Jesus.
In Luke we see some of the most loving and compassionate aspects of Jesus. He heals and comforts, the miracle of His love knows no bounds. He is an especially kind friend to all women; he stops to talk with worried women, women with health issues, a prostitute and a woman who's lived with several men. He also appears first to women after His resurrection. Even after His resurrection, out of love, Jesus stops to talk to two sad disciples on the road to Emmaus.
Jesus anointed others with the Holy Spirit as a helper and guide to assist His disciples. He then asks them to go out and spread the Good News to others.