Foundations of Stem Cell Culture: Provide a comprehensive overview of stem cell culture techniques, including the isolation, propagation, and characterization of stem cells, with a focus on three-dimensional (3D) culture systems. Three-Dimensional Culture Techniques: Explore various three-dimensional culture techniques used in stem cell research, including scaffold-based cultures, organoid cultures, spheroid cultures, and microfluidic platforms, with discussions on their advantages, limitations, and applications. Engineering Microenvironments: Discuss the engineering of microenvironments for stem cell culture, including biomaterials design, surface modifications, biochemical cues, mechanical forces, and bioreactor systems, with insights into how these factors influence stem cell behavior and fate decisions. Challenges and Future Directions: Address the challenges and future directions of three-dimensional stem cell culture, including scalability, reproducibility, standardization, ethical considerations, and regulatory issues, with discussions on emerging technologies and innovative strategies for overcoming these challenges.