Explore the second lecture in a three-part series on Random Matrix Theory Applications, delivered by Thomas Guhr from the University of Duisburg-Essen, Germany. Delve into the intricate connections between random matrix theory and quantum chaos, spanning from single-particle to many-body systems. Gain insights from this comprehensive 1 hour and 42 minute talk, part of the ICTP-SAIFR School on Quantum Chaos held from August 21 to September 1, 2023. Expand your understanding of advanced concepts in quantum physics and mathematical modeling as you follow Professor Guhr's expert analysis and explanations.