[LilFarmer]

There are still recipes around for making sourdough starter from “wild yeast”.

https://www.thekitchn.com/how-to-make-your-own-sourdough-starter-cooking-lessons-from-the-kitchn-47337

[Oshkalaboomboom]

You can easily make your own starter from wild yeast but the author of the article gave the impression that you could get enough wild yeast to make bread just by leaving dough in the air. You have to make your starter first then use the starter to make the bread.