The first 4 books of the New Testament (NT) make up what's commonly referred to as the Gospels. That's because they include the Gospel Message or Good News of how to attain eternal life! Each book features a different telling of the life of Jesus from various perspectives.
Below is a 5-part series of vidoes that give a general overview of the Gospel message according to Mark and Luke. It'll take you about 25 minutes to watch them all.