Find a subject in front of a background with depth. Take a close viewpoint and zoom in; you’ll need to be aware of the minimum focusing distance of your lens. Focus on the subject and take a single shot. Then, without changing the focal length, set the focus to infinity and take a second shot.
As you look at both the images you will notice in Image 1 that eye is drawn straight to the subject in focus and the background becomes nothing more than a backdrop of colour. Image 2 however the viewer is left to trail around the whole image with the out of focus statue becoming more of an annoyance.