Understanding the deep underlying theories behind everything allows for a high-level understanding of how everything works, accessible to anyone. The four foundational theories mentioned are quantum theory, theory of computation, theory of evolution, and theory of knowledge. Quantum theory is considered deeper than the theory of relativity, but a unification of the two is expected. The book 'The Beginning of Infinity' is wide-ranging and difficult to fully understand. Many claim to have read it, but few truly comprehend it. The speaker plans to continuously study 'The Beginning of Infinity' and 'The Fabric of Reality' to gain a deep understanding. The speaker recommends obtaining the book in various formats and emphasizes that it provides a unique world view, going beyond the perspectives of physicists, philosophers, and mathematicians.