What are the fundamental principles of quantum mechanics?
What are the fundamental principles of quantum mechanics?
user
You’ve said that quantum mechanics is the study of energy and matter.  In classical mechanics, objects tend to have specific values for all the properties, and those properties don’t change over time.  In quantum mechanics, instead, an object might exist in a combination of different states at once, and different combinations of properties are possible.  This is a big difference between the classical theory and the quantum theory, and what leads to the strange and unexpected behavior of quantum systems.
assistant
When did I say that quantum mechanics is the study of matter and energy?
user