Gohan probably learned the Kamehameha in the Hyperbolic Time Chamber from Goku, when they trained together for the Cell Games.
There is a scene in the anime where Gohan performs the Masenko during the Saiyan saga, but shouts "Kamehameha", but this was an error on the part of Toei Animation.
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It is generally accepted that Goku is the strongest single character on Dragon Ball Z. If combined, Vegito, which is a combination of Goku and Vegeta is more powerful than Goku.
Well, there is the order for the Dragon Ball series: 1 - Dragon Ball (starts with Goku as a child and finishs when Goku marrys) 2 - Dragon Ball Z (starts when Gohan, Goku's son born, and finishs when Z Fighters beat Majin Buu) 3 - Dragon Ball GT (starts when Goku is training with Uub and finishs when Goku finds 7 Black Star Dragon Balls and the dragon grants his wish) 4 - Dragon Ball AF (i don't know about it but Goku there goes ssj5) P.S. As for Dragon Ball Kai, that's like Dragon Ball Z but its redrawn.
After the androids drain goku\'s power in Dragon Ball Z Kai he returns to his future.
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Goku and Vegeta