how to create a landscape that has multiple biome terrains?

i went through the “first hour in uefn” course and it showed me how to make a landscape and sculpt it, but i cannot figure out how i make multiple different biomes across my large map that i can make fade into one another like a plain that becomes a snowy forest.

also, i read something that pointed me toward layer painting, but i created a rippled sand landscape and i can sculpt it, but when i go to paint there are no layers and i don’t see an option to add one.