In today's digital age, the rapid advancement of educational technology is profoundly transforming the forms and models of teaching and learning. With the deep integration of information technology and education, educators are continuously exploring innovation to meet the demands of education in the new era. This chapter collects a series of cutting-edge educational technology application cases within the secondary education context, covering multiple disciplines, models, and technologies. These cases not only demonstrate the immense potential of educational technology in enhancing teaching efficiency, optimizing learning experiences, and promoting educational equity, but also reflect the innovative spirit and practical wisdom of educators when facing challenges. Through an in-depth analysis of these cases, we aim to provide valuable insights and inspiration for educators, driving the application and development of educational technology across broader fields and contributing to the realization of educational modernization.