What does 1 John 5:20 mean?

We also know that God’s Son has come and given us understanding, so we can know the true God. And we’re in the true God—by being in his Son, Jesus Christ. He is the real God and eternal life. 1 John 5:20 - Modern Text Bible

(Jesus helps us truly know God, and being connected to him means we’re connected to the source of real, lasting life.)