This book proposes a fundamentally new framework for quantum theory rooted in real physical fields defined in Minkowski space, instead of the conventional Hilbert space formalism. It introduces a physically realistic model of fermions, built from coupled strings that explain spin, interference, entanglement, and the Planck constant, all without imaginary numbers or wavefunctions. The approach resolves longstanding paradoxes like Bell’s inequality violation and Einstein-Podolsky-Rosen correlations through a deterministic model with hidden variables. The book guides the reader from quantum basics to experimental implications.