Augmented Reality (AR) and Virtual Reality (VR) transform how surgeries are planned, practiced, and performed. Our research group utilizes AR and VR technologies in surgical training, planning, and intraoperative guidance. In surgical training, VR simulations provide a risk-free environment for surgeons to hone their skills and practice complex procedures. For surgical planning, AR enables surgeons to visualize and interact with patient-specific anatomical models in 3D, offering unprecedented insights into the patient's unique anatomy. During surgery, AR systems can overlay critical information, such as imaging data and surgical guides, directly onto the surgeon's field of view, enhancing precision and decision-making. These technologies are not only improving the effectiveness of surgical education and planning but are also directly contributing to better patient outcomes during actual procedures.