Do you take portraits with fixed focus or telephoto? What are the advantages of each?

I think this problem can be chosen from two aspects: practicality and performance. If you pay attention to practicality, then choosing a zoom lens will better meet your requirements. Because the focal length of zoom lens is variable, it is relatively more practical. Because the subject chose the portrait lens for the first time, it can be seen that he is also a beginner in photography. For beginners, choosing a zoom lens can make it easier for you to understand the characteristics of each focal segment and know which focal segment you are good at, laying the foundation for future shooting. If you are interested in the quality and performance of imaging, then I think you should choose a fixed-focus lens to shoot portraits. I'm afraid no one can compare with fixed-focus lens in imaging quality. The reason why the fixed-focus lens has high imaging quality and light weight is mainly because of its simple design and stable and reliable structure. Of course, its biggest disadvantage is that the focal length is fixed and there is no way to change the focal length.