The second edition of the Online Teaching Fundamentals course will begin on February 15th. As preparations are underway, the NATO DEEP eAcademy Team has developed a booklet – a comprehensive guidebook for participants, designed to provide essential information about the course’s structure, objectives, and expectations. This booklet offers detailed descriptions of the ten modules, covering topics from core online teaching fundamentals to advanced methodologies, emerging technologies, and professional development. It also highlights key tools and platforms that will be used during the course, including BigBlueButton and LMS ILIAS. The guidebook’s primary goal is to ensure a seamless and enriching learning experience, equipping participants with the knowledge and skills to effectively teach in an online environment. As a blended learning program, this edition emphasizes both theoretical understanding and practical application, reflecting NATO DEEP’s commitment to advancing e-learning capabilities.The booklet is available in the dedicated resource section of NATO DEEP publications: https://deepportal.hq.nato.int/eacademy/deep-publications-2/