What are the skills to choose SLR photography mode?

There is no skill to choose the appropriate mode according to your shooting purpose (take several common modes as examples):

P: program automatic exposure. The camera automatically sets the aperture size and shutter speed according to the scene light to adapt to the brightness of the subject and make the photo exposure appropriate. You can choose P file when there is no special shooting purpose.

Av: Aperture priority automatic exposure, users adjust the aperture size, the camera automatically sets the shutter speed according to the scene light, users can freely adjust the aperture size to control the depth of field, and can choose aperture priority automatic exposure when depth of field is needed.

TV: Shutter gives priority to automatic exposure, users adjust the shutter speed, the camera automatically adjusts the aperture size according to the scene light, and users can freely adjust the quick purchase speed. To cure or take photos of moving tracks, users can choose shutter priority automatic exposure.

M: manual exposure. Users can set the aperture value and shutter speed by themselves.

B: Door B, a long exposure file, is used to shoot night scenes, astronomy, star tracks, fireworks and other subjects that need long exposure.