What are the traditional scenery changing techniques?

Ok, I'll teach you a way. If the scene change is uncomfortable, you can try to split the story into two lines, one is about the protagonist, and the other is about important writing clues that the protagonist doesn't know, so that readers can understand. It won't be sudden. Finally, pay attention to the connection between shots, just like the structure of 2= 1+ 1=2, the scene change will not be stiff and look more emotional.