Twist and Shout

Shoot vertical subjects vertically. It's a simple rule for great pictures but in the digital age it is even more important for two reasons. First if we keep the camera horizontal for a subject that is actually up and down we are wasting a lot of space in our image. To make a good print that space will need to be cropped and cropping is a waste of pixels. Those wasted pixels reduces image quality and limit the largest (most expensive) print that can be printed from that image.
Once we've shot the subject vertically we need to upload it rotated to the correct position. In a study of over 1000 online news photos. Not a single unrotated vertical image was purchased, but the likelihood of a rotated vertical image being purchased was more than double that of a horizontal image.