Please do not dismiss this link because it talks about iphoneography. The photography tips in these videos teach photography not just for the simplicity of the smart phone but because it provides very important tips about photography in general whether you use a Nikon D4 and lenses or just a phone only.
Smart phones for doing photography have come a long way having really improved.
While I am still a Fuji X photographer I can no longer put aside the Smart Phone as especially the iphone 6+ as not being a “real” photographic tool. Time and advancements in image technology has changed that.