A 4-day online course for trainers to enhance their understanding of EOSC and related topics. Participants also gained insights into how to integrate the coursework into their own EOSC training activities. Day 1: Preparing to give training on EOSC. Day 2: Using the EOSC Portal. Day 3: Addressing legal and ethical issues related to using EOSC. Day 4: Crafting your own training using the EOSC Knowledge Hub and other resources. https://eoscfuture.eu/eventsfuture/train-the-trainer-an-active-learning-course-on-understanding-using-eosc/