I have read a number of books on photography, in an effort to accelerate my education (as well as shooting). Recently I read a number of Bryan Peterson's books where he advocates what he calls "story telling apertures" primarily for landscape shots of f18, f22, and higher. What is confusing to me is that when I look at the galleries on this site, Brian's beautiful landscapes are usually shot at between f8 and usually f11. I have also read on this site and others that shooting at apertures above f11 starts to degrade the sharpness of the image. So what's "correct" , realizing that there is no one best aperture etc. I'm just looking for some general guidance.
Thanks in advance and I apologize if this is a dumb question, to the more experienced shooters here.