They dont. Goku accidentally proposes.
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goku learns the kamehameha on the movie path of power (Edit: Goku first performs a kamehameha wave in the 8th episode of dragon ball)
It is not in an episode, in the first episode of Dragonball Z it shows Guko with his son as a child.
Goku turns SS4 in Episode #35 gt.
The episode in which Chi Chi and Goku fight is episode 137. It's also the episode in which Chi Chi becomes Goku's fiancee.
episode 35