First of all, what is the first cause theory?
If there's a cause for everything,
If you follow the cause of an event, it will lead to infinity and you will not be able to specify the cause of the event.
Therefore, the conclusion remains that "at least some things do not have a cause."
Imagine that you have a videotape.
Video footage shows the first piece of a domino being pushed by a person, and the dominoes fall one after another.
This videotape shows the connection between cause and effect.
The first video clip of this videotape shows a person knocking down the first piece of dominoes with his or her hands.
In other words, the first cause is the movement of the human hand.
In this image, there is no cause image before the appearance of the human hand.
In other words, in the world on video tape, there is no "cause of the first cause."
But the cause of beginning of the world of the videotape is the motor of the video machine.
The important thing here is that
The world in this videotape is distinct from the world of motors, the outside world.
That is, we may be virtual beings living on video tapes.
If the first cause exists, then the cause of the first cause lies in the outside world where the causal system is different.