The Lord is greater than any other gods

Exodus 18:1-12
Jethro, father-in-law of Moses, said '"Praise be to the Lord, who rescued you from the hand of the Egyptians and of Pharaoh...Now I know that the Lord is greater than all other gods, for he did this to those who had treated Israel arrogantly."
Moses's two sons, their names are
Gershom: I have become an alien in a foreign land.
Eliezer: My father's God was my helper; he saved me from the sword of Pharaoh.
In religious matters, however, he learns from Moses.
It is not clear when Zipporah returned home - perhaps soon after the incident recorded in 4:24-26 (circumcision by Zipporah took a flint knife)
Why?
Jethro, father-in-law of Moses, and he was priest of Median who admitted that the Lord is greater than all other gods, so he also brought a burnt offering and other sacrifices to God.
Moses's two sons means his significant changed in he life.
How?
The Lord is greater than any other gods.