How to distinguish between special effects and real shots of film and television works?

Every time I watch an American blockbuster, I am deeply shocked. Wow, the content in it is so exciting and thrilling! But what is the real shot, what is the green screen background, what is the post-special effect, and what is the real effect?

For example, you think this night scene is a normal city real shot:

But it's actually like this.

Game of Thrones: I knew it was impossible to climb an iceberg, but I didn't expect to shoot it on my stomach ... good acting.

In short, the value of today's film and television special effects is not only to show things that don't exist, but to control special effects better than real things.

So the conclusion is that if you "distinguish" a special effect of the earth that is not a monster, a talking frog or an explosion with the naked eye,

That is not done well!