The DDI Training Group organized a series of tutorials around the 2021 European DDI Users Conference. This included a general overview of the DDI standards on Friday 26 November, followed by a series of more detailed tutorials and a session describing the software tools and services available for implementing DDI, all on Monday 29 November. A short description of each session is available here, along with recordings and presentations. DDI Codebook is a metadata specification for providing detailed, machine-actionable and human-readable metadata about individual studies and their data files in an XML format. Instructors are Jane Fry of Carleton University and Adrian Dusa of the University of Bucharest, who will introduce you to this popular metadata standard. Please note that the date on the title slide is incorrect: the presentation actually took place on Mon 29 November 2021.