Tangential topic, but does anyone have a good no-nonsense evidence based source for how to make bread and/or sourdough?

I've been trying sourdough and it's crazy how many contradictory pieces of advice and explanations you read e.g. if the yeast comes from the initial flour or air, what ratio of flour + water to feed it with, how many times a day you feed the starter, how many times you let the dough prove. It generally indicates to me that the process is very forgiving though (as so many variations work).

I would have thought most myths would have been put to bed by now as it should be relatively easy to run cooking experiments if you want to debunk something.