Explore the intersection of quantum information, complexity, and gravity in this advanced lecture from the Quantum Summer Cluster Workshop. Delve into Patrick Hayden's in-depth analysis of how quantum mechanics is geometrized in quantum gravity. Gain insights into recent advances, including the proper calculation of Hawking radiation entropy and the complexity=action conjecture. Learn how to perform calculations that go beyond conceptual understanding, providing a practical approach to these complex topics. Discover the recurring motifs in quantum gravity and their implications for our understanding of the universe.