How is quantum theory conceptual view explained?

Quantum theory gives us with the rules and regulations of the small world. The quantum theory conceptual foundation is mysterious. This led to intense debates in between scientists and confused several. Niels Bohr, one of the most prominent scientists into this domain, when remarked as, 'You have not studied quantum mechanics well when you aren't confused by this.' Albert Einstein, who is the greatest physicist of the 20th century, never approved of such theory. Bizarre though this may seem, quantum physics has led physicists step by step to a full of meaning view of the reality, and has answered various fundamental questions.