How to take a photo with trailing effect

The effect you mentioned is achieved by changing the shutter speed, that is to say, with a relatively slow shutter speed, about less than 1/30 seconds, you will have enough time to follow the subject when shooting, so that the object you follow is clear, while other places are blurred, which is called follow-up in our photography terminology.

Another method is to rotate the lens barrel with a zoom lens at the moment of exposure, but don't shake it from side to side. In this way, by changing the focus range, the subject is all clear because it has been focused, and the surroundings will be blurred because of the change, which is often used to shoot the explosion effect. I often use this effect to shoot sports meetings, which is very dynamic.