This eContouring session will provide a comprehensive overview of treatment planning, contour delineation, and identification of organs at risk for a range of cancers, including gastrointestinal, head and neck, and thoracic malignancies. Participants will receive detailed instruction from expert faculty, covering best practices and the latest guidelines. In addition, registrants will have the opportunity to access hands-on practice cases prior to the session. Participants will not be required to do live contouring during the session, so no need to bring a laptop.