So this video is a pretty good explanation of quantum field theory.

Like Schreudinger’s cat, which can be dead or alive, and will be in a superposition of both until observation happens again.

This idea is based on a misunderstanding of what Schrödinger actually said. The concept of the cat existing in a superposition state was not meant to be taken literally and is not an example of anything that is currently believed to be true about the physical universe.