Night photography is one of the most difficult forms of photography to master due to one simple fact. In order to get decent shots you often have to be in complete darkness, which means you can't see anything. This can make framing tricky and as such requires a lot of trial and error to get the composition you want. I have always found the night sky to be one of the most amazing spectacles to enjoy, especially if you're treated to Orion's Belt or the Milky Way. It also requires a high threshold to the cold as you're going to be in it for a long time.