The Big Tech Watch educational module addresses the growing challenge of fostering informed digital citizenship in an era marked by the erosion of a coordinated and equitable public debate, further strained by rapid digital transformations. Developed within the framework of the Horizon Europe INCA project, the module is designed for middle and upper secondary schools to raise awareness among students about the individual and societal implications of digital platforms and to enhance their critical thinking skills. Developed through an interdisciplinary approach, the module includes a comprehensive set of teaching materials, a detailed guide for educators, and key theoretical references. It is designed for flexible use and can be adapted by teachers across different educational contexts and disciplines such as geography, history, civics, economics, and social sciences. Below the complete set of teaching materials and the user guide.