What are the characteristics of telephoto lenses?

Telephoto lenses are widely used in sports, scenery, animals, portraits and other fields, but the high magnification and small viewing angle of telephoto lenses also bring some problems-it is difficult to keep the camera and lens absolutely still without shaking. Strong wind, floor vibration, aftershock of camera mirror beating, etc. Can make the lens vibrate. The photographer held it in a cold, tired and incorrect way.