In the Old Testament, there are 3 kinds of laws:
1) Ceremonial Laws (laws that govern the kind of rituals and sacrifices to make in order to approach God) These have now been replaced by the New Testament Law of approach to God through Jesus Christ.
2) Civil Laws (laws that govern daily living in Israel) Some of these laws may not apply to us because of cultural, geographical and historical differences but their principles are still applicable and should be used to guide our daily living.
3) Commandments (Moral Laws) The 10 commandments are still as applicable today as it were years ago in Moses' time. The New Testament does not replace them but we can fulfill their requirements through Jesus Christ our Lord.