It looks like most of it is just about astrophotography and astronomy in general. There is some specific to smartphones, but even a lot of the example images Hubble/professional images taken with professional equipment. Unless I'm just not seeing it somehow, it seems to be completely lacking in how to affix your phone to your telescope, which would probably the most important thing to know specific to phone photography. Additionally, focusing is a huge issue with phone cameras when dealing with low light astrophotos, and I didn't see anything on that.