Anime transformations as we know them wouldn't exist without Dragon Ball Z, and these are the absolute strongest forms in DBZ.
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.
So far in Dragon Ball Daima, we’ve seen both Goku and Vegeta transform into Super Saiyan levels one and two, with the Saiyan Prince revealing his Super Saiyan 3 transformation for the first time.