There is only one law of God. It does need to be correctly discerned, but most do not rightly divide the word of God, they simply divide.
They say the Ten Commandments is under Mosaic law or under the Old Testament. They say the laws in Corinthians were only for the Corinthians. Do they not know the Holy Bible was written to you and to me?
There have been changes to the law which should be noted by every Christian. Animal sacrifice for sin came to an end at the death and resurrection of Christ. He is the ultimate sacrifice for sin and now there can be none other. The dietary code of the Old Testament came to an end with Peter’s dream opening Christianity to the gentiles. God cleansed all animals to be eaten with thanksgiving.
Whatever law or precept you find in the Old or New Testament is good and most likely meant to be followed. There is one law. It applies equally to you and to me.
You might ask yourself a few questions when reading the law. Do I love the Lord enough to keep it? Why does God want me to keep it? Why was it written in the Bible, in any particular part or chapter? Knowing the law do I feel guilty if I break it? What blessings come with obedience?
It doesn’t hurt to ask questions. The truth will not be offended and there are eternal blessings in the answers.