How can I take pictures of the sky?

It is just two photos of people and scenery processed by PS, which is extremely easy to do in PS.

But you can also take some action photos like this.

First, adjust the focal length and viewing angle, and set a higher shutter. In the waiting process (digital camera should press the shutter to lock the focus), let the subject jump off it and press the shutter properly.

You can't look at a still image and jump down is the same as jumping up. Even in a real movie, even if the actor jumps down, you can use "reverse video" to let the audience see that the actor is flying up.