What are 3 differences between the Old Testament and the New Testament?

Differences between the Old and New Testaments:
  1. They were written at very different times
  2. They were originally written in different languages (Old Testament in Aramaic and Hebrew, New Testament in Greek)
  3. The laws of the Old Testament were much more harsh. After the introduction of Christ in the New Testament, forgiveness and grace were a much heavier theme.