Redemption means to secure the release or recovery of persons or things by the payment of a price. It is a covenantal legal term closely associated with ransom, atonement, substitution, and deliverance, thus salvation. Theologically, redemption refers ultimately to the saving work of Christ, who came to accomplish our redemption by giving his life in substitution for our own as the ransom price.https://www.thegospelcoalition.org/essay/redemption/
Redemption (apolutrósis) refers supremely to the work of Christ on our behalf, whereby he purchases us, he ransoms us, at the price of his own life, securing our deliverance from the bondage and condemnation of sin. The New Testament speaks of Christ's saving work in this way frequently.https://www.thegospelcoalition.org/essay/redemption/
The law of God helps us to know God, know ourselves, know our need, and know the life of peace and blessedness. It helps us to know God because it specifically reveals his character and his attributes, his holy will, what he's like.