Let's not beat about the bush, quantum mechanics and quantum physics (from now on, I will only use the term "quantum physics", to avoid repeating myself unnecessarily) are not "easy" subjects to understand.  This stems from the fact that quantum physics describes the world of atoms and even smaller things, and we can't see into that world and observe how atoms and electrons and protons behave.  Quantum physics throws up some results that are counter-intuitive to what we are used to in our every day world, a world in which we only need open our eyes and look at what's happening around us.  We don't have this luxury with the quantum world, and the surprising results can sometimes make us feel uncomfortable, even if only in our minds.

I've written this item in a number of sections, as below.  Each is reasonably stand-alone, but you might get the best benefit if you start at the beginning and work your way through.  I should point out that the views given here are my own interpretation of quantum physics, developed through a number of years of learning about the subject and applying it.  I have made no attempt at a rigorous treatment, such as you might find in a textbook about quantum physics, and I have kept the maths to a minimum.

 

The Death of Classical Physics

Wave Particle Duality

Heisenberg Uncertainty Principle

Wavefunctions and Schrodinger's Equation

Energy Quantisation