How does 18-55 of Nikon d3200 take clear photos with blurred background? What are the skills?

There is no good way to limit lenses and cameras. Try opening the aperture to the maximum (the larger the aperture (the smaller the f number), the greater the blur), and then use the focal length of 55MM (the longer the focal length, the greater the blur). If you want to shoot a person, there should be a certain distance between the person and the background (the farther the distance, the more blurred the background). As long as the above points are achieved, the landlord's camera can take the most blurred background.