Question:
Christians do not have any commandments to follow in order to go to heaven, but do they have any commandments to follow once they are saved?

Answer:
“All the law is fulfilled in one word, even in this: Thou shalt love thy neighbor as thyself” (Galatians 5:14).

The first commandment is, “Believe on the Lord Jesus Christ and thou shalt be saved” (Acts 16: 31). The second commandment is to “Love the brotherhood” (1 Peter 2:17).
“Herein is love, not that we loved God, but that He loved us, and sent His Son to be the propitiation for our sins. Beloved, if God so loved us, we ought also to love one another” (1 John 4:10, 11). “For this is the love of God, that we keep His commandments: and His commandments are not grievous” (1 John 5:3).
We do not need to run from God’s commandments, but we should be like a team of oxen working together and enjoying all of God’s wonderful things. “Who giveth us richly all things to enjoy” (1 Timothy 6:17).
What a contrast are “the pleasures of sin” which are only “for a season” (Hebrews 11:25), and we know that that season will soon end. We need an understanding of what Christianity is. It is knowing a Person, even the Lord Jesus Christ as Saviour, Lord, and Friend. Paul said: “I know whom I have believed, and am persuaded that He is able to keep that which I have committed unto Him against that day” (2 Timothy 1:12).