What kind of ability should a photography assistant have?

I think: you must first understand the relevant photography knowledge, which must have been learned when you studied photography. You should apply what you have learned, be diligent in your eyes and be quick in your hands. Can bear hardships. The salary will be very low, and the average assistant doesn't need too many skills, because the assistant has no chance to get the camera. Just master the angle of light. It is to accumulate more experience of experts at ordinary times. Keep it in mind. You know why photographers do this. It will be better for you to be a photographer in the future. Assistant is a hard job. You must be able to bear hardships.