And the rest is details...

Matthew 17:5 NASB95

While he was still speaking, a bright cloud overshadowed them, and behold, a voice out of the cloud said, "This is My beloved Son, with whom I am well-pleased; listen to Him!"

A voice from a cloud of glory.

A statement proclaiming Jesus's divinity and relationship with God.

A proclamation that God the Father was very satisfied with Jesus His Son.

And a command to listen to Jesus, to be attentive to Him.

And the rest is details....