Quantum mechanics is a branch of physics that investigates atomic and subatomic particles. A key aspect of this discipline is the quantization of physical properties like energy, angular momentum, and momentum. Objects examined in quantum mechanics demonstrate wave-particle duality, and there exists a fundamental limit to the precision in measuring physical quantities. The exploration of quantum entanglement is a significant and emerging area within this field. Quantum mechanics finds applications spanning from electronics and cryptography to quantum computing. This book provides comprehensive insights into the fundamentals of quantum mechanics. Different approaches, evaluations and concepts related to this field have been included herein. Through this book, we attempt to further enlighten the readers about the new concepts in this field.