The S4E Quality Assurance Framework (QAF) is a practical, community-endorsed reference that helps improve the quality of Open Science training courses. It's not a rigid standard but a set of flexible guidelines and best practices to help course creators make sure their learning materials are clear, FAIR and aligned with good practices. The S4E QAF promotes best practices and self-evaluation tools to ensure coherence between content and container: a course about Open Science should also embed Open Science principles in how it’s designed, presented, and shared.