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Given the following post, respond as if you're commenting on Reddit:
human
[Dragonball Z] Did Goku know what was happening when he was going Super Saiyan for the first time?

When he transformed fighting Frieza it was because he was angry. He stops and struggles with what seems like his emotions as a storm surges, and he screams, transforms, then was "calm" (as calm as you can be in that situation I guess) and gets ready to fight

Did Goku realize what had happened to him? Was he somehow able to know that a transformation was coming?
gpt
He was only thinking of one thing. Revenge. He was so emotional because his friend was dead and he knew he could do nothing about it. Frieza would then kill his son and himself. Goku fully believed he had lost.

After the transformation Goku has a lot more power. He doesn't know why he has more power, he doesn't care why. All he cares about is going after frieza.