How to improve portrait photography technology

In order to improve the technology of portrait photography, there are the following points: first, it is necessary to shoot clearly and focus accurately. Second, by adjusting the sensitivity, aperture and shutter time, the exposure should be appropriate. The third is to highlight subjectivity, answer what to shoot and express what content, which can be achieved through composition and shallow depth of field. Fourth, we should be good at communicating with the subject and be able to guide and guide the subject. Fifth, make more use of natural light. It is really necessary to use something like a flash to hit the wall to fill the light indirectly, or add a layer of astigmatism film in front of the flash.