The TRIPLE Training Toolkit is part of the work performed by Work Package 6 (WP6) under Task 6.3 in the TRIPLE Project (Transforming Research through Linked Interdisciplinary Exploration). The project is funded by the European Commission, under Grant Agreement No. 863420 and will run for 42 months starting from October 2019. The TRIPLE Open Science Training Series focuses on the design and delivery of competence-oriented training to address the specific and general needs of the research community on Open Science topics and on the EOSC. The experiment enabled a reflection on the current challenges to make FAIR-by-design training resources and how to overcome them. The following files are deposited in Zenodo to serve as a reference for those wishing to reproduce this experiment within their own institution or for their own training activities. Please note that the training series are still ongoing and as such the present document and the files listed below will be followed by updated versions by the end of the project (2023). The first document to read is the README.