I guess I never really thought about selling photos before I read this post.... But I suppose the best way to do it would be to use a great camera, get a high quality print, and sell a physical copy in an art gallery
I take em for fun/ past time and as referance for drawing studies later on.
Since I'm using my mobile phone (ie shooting at a lower quality, than with pro equipment) and I'm just doing it as a hobby, I don't sell my photos nor see any reason to.