How does the New Testament differ from the Old testament?

The Old Testament is for our learning which deals with laws,history and prophets before Christ came and died for our sins while the New Testament is about the life,death,burial and resurrection of Christ and the return of Jesus Christ.
The Old testament believes that their Messiah is human who will free them from the oppressors; and differ from the New Testament whose belief in a Messiah that is divine and will save mankind from sin.