The translation is idiot proof... For meThere’s some good explanations in the weight loss guide and plenty in other threads on here.
I like to know the mechanics and cause and effect behind things where possible. Lol. Too high humidity means too big a chick and too small an air cell, and possibly too much fluid still in the egg, which translates into less eggs hatching.
you might have to play around with a few hatches until you find optimal settings for your location and incubator.