No Rules for Christians Other Than to Love God and Love Others?

Questions about how to answer someone who says Jesus’ fulfillment of the Law means that loving God and loving others are the only rules Christians have to follow and fulfilled prophecies in the Bible.

• How would you answer someone who says Jesus’ fulfillment of the Law means there are no rules Christians have to follow other than to love God and love others?
• Can you give more details about fulfilled prophecies in the Bible?