Learn hands-on numerical simulation techniques for light and cold atom systems in this 92-minute lecture from the IV School on Light and Cold Atoms. Explore practical computational methods and numerical approaches used in atomic physics research through guided examples and demonstrations. Develop skills in implementing and running simulations relevant to cold atom experiments and theoretical studies. Gain experience with computational tools and techniques essential for modeling quantum systems involving ultracold atoms and their interactions with light. Build upon foundational concepts to tackle more advanced numerical problems in atomic and molecular physics through step-by-step instruction and practical exercises.