Before Jesus, the Jewish people had a sacrificial system in which to be made right with God you had to follow rules to make the right sacrifice in the right way at the right time done by the right person. When you break the law there is a price to pay, either a fine or prison sentence. Jesus died in place of all these sacrifices. He took our place.
Read Romans 3:23-26. Our God is a God which will go to any length to save us. Ask him to reveal himself more to you today.