Hebrews 8:10 KJV
For this is the covenant that I will make with the house of Israel after those days, saith the Lord; I will put my laws into their mind, and write them in their hearts: and I will be to them a God, and they shall be to me a people:
The only way to learn the law is through hearing. You can hope to hear all you need to know in Church or you can read the Holy Bible for yourself. I recommend both. Read the Holy Bible and use it to study and verify what you hear from every speaker.
A great place to start is Exodus 20 and the Ten Commandments. To fully comprehend the law you’ll need to read both the Old and the New Testament of the Holy Bible.
What laws then should I follow? Follow what the Lord writes on your heart. What he’s written on mine I am obliged to share.
In Matthew 28:19-20 KJV, Jesus said, Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost:  Teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you alway, even unto the end of the world. Amen.
The Ten Commandments are valid, present day Commandments of Jesus. In fact, Jesus taught them. Mark 10:19, Luke 18:20 He also instructed that mercy and love are to be a part of the law. John 8:7
The law did have two significant changes between the Old and New Testament. Here are those changes God made to the law:
- The dietary laws were revoked in Peter’s dream opening the Gospel to the Gentiles. Acts 11:9
- Sacrificial law or animal sacrifice for sin ceased at the death of Christ on the Cross. John 3:16, Hebrews 10:12
Do you love Jesus enough to keep his Commandments? How much do you actually value his sacrifice?