Goku's had a lot of different forms from the original series, to DBZ, Dragon Ball GT, Dragon Ball Super, and most recently Dragon Ball DAIMA.
Across the original Dragon Ball, DBZ, Dragon Ball GT, and Dragon Ball Super, Goku fights, survives, & even wins against ...
Anime transformations as we know them wouldn't exist without Dragon Ball Z, and these are the absolute strongest forms in DBZ.
For every villain Goku beats, there are two he didn't defeat, giving the rest of Dragon Ball's cast some time in the spotlight.