TOTEM Masterclasses is an educational activity of CERN's TOTEM Experiment at the LHC in the framework of the International Particle Physics Outreach Group (IPPOG) program. TOTEM Masterclasses offers students worldwide an opportunity to participate in the groundbreaking research on proton-proton interactions done by the TOTEM experiment. Through this online material, students will be guided through the necessary background information about TOTEM before conducting the challenging experience of analyzing data from the LHC and discovering the complexities of proton interactions.