Composition skills of local portrait photography in SLR photography

SLR camera, you can choose different focusing methods. There are several kinds of focusing, multi-point focusing. You can use a little focusing method to adjust the focus to the focus you want to shoot. In this way, the focus is clear, and the non-focus is the virtual point. A large aperture is correct, so the depth of field is small. Use manual focus instead of autofocus. All in one place, of course, not in the center of the picture.