Learn hands-on numerical simulation techniques for light and cold atom systems in this 94-minute lecture from the IV School on Light and Cold Atoms. Explore practical computational methods and numerical approaches used to model and analyze cold atomic systems under the guidance of Johannes Schachenmayer from Université de Strasbourg. Develop skills in implementing numerical simulations that are essential for understanding complex quantum many-body systems involving ultracold atoms and their interactions with light. Gain experience with computational tools and techniques commonly employed in atomic physics research, building upon foundational concepts to tackle real-world simulation challenges in the field of cold atom physics.