What does Deuteronomy 4:1 mean?

Now, Israel, listen to the rules and instructions I’m teaching you. Follow them, so you’ll live and go in and take the land the Lord, the God of your ancestors, is giving you. Deuteronomy 4:1 - Modern Text Bible

(Moses urges the people to pay attention and obey God’s commands, because their future in the promised land depends on it.)