To understand 80% of Quantum Physics, we will focus on these 20% essential concepts: Wave-Particle Duality: The concept that all particles exhibit both wave and particle properties. A foundational principle, it forms the backbone of quantum physics. Uncertainty Principle: Heisenberg's Uncertainty Principle tells us that we can never simultaneously know the exact position and momentum of a particle. Quantum Entanglement: This concept describes how particles can become 'entangled' so that the state of one can instantaneously affect the state of the other, no matter the distance between them. Superposition: It's the ability of a particle to be in multiple states at once — an idea famously encapsulated in Schrödinger's cat paradox. Quantum Field Theory: This theory combines quantum mechanics and special relativity and describes particles as excited states of a physical field. Understanding these principles will give you a strong foundational understanding of Quantum Physics.