Gospel means good news. The four Gospels in the New Testament are four accounts of Jesus’ life, death and resurrection. They overlap a lot, but each has its own angle.
Mark
The shortest and fastest. Many scholars think Mark is the oldest Gospel. It stresses what Jesus does.
Matthew
Written with readers of Jewish background in mind. It shows that Jesus fulfils what is written in the Old Testament, and gathers his teaching in five great speeches, among them the Sermon on the Mount.
Luke
Writes an ordered account and cares about the poor, women and the outcast. It has the Christmas story and many of the parables, such as the Good Samaritan.
John
Different in structure and language. It is about who Jesus is, with the great “I am” sayings: the bread of life, the light of the world, the good shepherd.
Where should you start?
Many begin with Mark for the pace, or John for the depth. Reading several tells you more than reading one, because you see Jesus from several sides.