Dive into an in-depth tutorial on Juan Maldacena's lectures, presented by Yiming Chen at the Kavli Asian Winter School on Strings, Particles and Cosmology. Explore key concepts in theoretical physics, including the Unruh effect, Hartle-Hawking vacuum, and black hole information paradox. Gain insights into advanced topics such as proper time in Minkowski space, Lorentzian perspectives, and Rindler coordinates. Learn about massless scalar fields in two dimensions, point-splitting UV regularization, and two-point functions in Minkowski space. Examine detector models in various spacetimes, including flat space and black holes. Understand different vacuum states like the Unruh vacuum and Boulware vacuum. Benefit from multiple Q&A sessions throughout the tutorial to clarify complex ideas and deepen your understanding of cutting-edge research in high-energy physics.