How to Ferment Yeast

There's still yeast all around us in the world. You can do a lot of just like attracting yeast to a thing it wants to eat and then make that into a starter for bread. So did we kind of like we would just sort of leave bread dough out or sugars out and the yeast would just come to it? We're like hey great but we didn't realize yeast was doing stuff. I mean they're tiny and they make our bread puff up. Of course we wouldn't get it like that's weird.