Explore the frontiers of gravitational-wave astrophysics in this 47-minute conference talk by Ilya Mandel from Monash University. Delve into the unknowns of this rapidly evolving field, covering topics such as black hole masses, spin distributions, selection effects, and supermassive black holes. Gain insights into the challenges and opportunities presented by current and future gravitational-wave experiments, including Advanced LIGO/Virgo and upcoming space-based observatories. Discover the interdisciplinary connections between field theory, stellar evolution, and cosmology, and learn about the latest advances in precision modeling of gravitational-wave signals. Examine the potential for uncovering new physics embedded within these signals and explore emerging tools and techniques from classical and quantum field theory.