The OT is very important. The 10 commandments are to be followed, they are not just some “suggestions.” We need the OT to lead us into the NT.
The “ceremonial laws” (observing the Sabbath, certain ways of worship like animal sacrifice, circumcision, etc…) and the “dietary laws” (not to eat pork, shell fish etc…) are no longer valid. These laws have been “fulfilled” by Jesus.
The “moral laws” are still valid (10 commandments, homosexuality being a sin, etc…).
As an earlier poster said, if it is in the Catechism, then follow it:thumbsup: