This lecture introduces the concept of flipped classroom, where students engage with online lectures before attending class to ask questions. The instructor emphasizes the importance of interaction and questions to enhance learning. The theoretical part covers the basics of materials science and the structure of materials, with a focus on understanding key concepts. The lecture also addresses the total time commitment required for online lectures and in-class sessions. Students are encouraged to actively participate, ask questions, and interact to achieve a deeper understanding of materials science.