Yes, according to our current understanding of fundamental physics, everything in the universe is composed of quantum fields. Quantum fields are fundamental entities that pervade all of spacetime. They are the building blocks from which particles and forces emerge.
In quantum field theory, which is the framework that describes the behavior of quantum fields, particles are understood as excitations or quanta of these fields. For example, the electromagnetic field gives rise to photons, the particles of light, while the electron field is associated with electrons. Each type of particle corresponds to a specific quantum field.
Quantum fields are characterized by their properties, such as their energy, momentum, and spin. The interactions between these fields and their excitations give rise to the fundamental forces of nature, such as electromagnetism, the weak force, the strong force, and gravity (although gravity has not been successfully incorporated into a consistent quantum field theory yet).
It's important to note that quantum fields and their associated particles are not made of anything more fundamental in the conventional sense. They are considered to be the fundamental entities from which the universe is constructed. However, our understanding of the ultimate nature of reality is an ongoing area of research, and future discoveries may deepen our understanding further.
Quantum field theory has been highly successful in describing the behavior of particles and their interactions, and it forms the basis of the Standard Model of particle physics, which encompasses our current understanding of the fundamental particles and their interactions, except for gravity.