If you can’t be parted from your smartphone camera, maybe it’s time to take that passion to a new level. Photography can be a way to observe and document the world around you, as well as an art form that affords countless opportunities for self-expression. To gain a foothold in the myriad options available in a digital SLR, start off with the basics, including exposure, ISO and aperture. Once you’re confident enough to shoot, delve into everything from fashion to travel to portrait photography.