The EUDAT Summer School held from July 3-7, 2017, in Crete focused on data sharing, management, and the importance of adhering to fair data principles in research. Despite existing data sharing policies from organizations like Science, PubMed Central, and the NIH, the document outlines significant challenges faced by researchers, such as access difficulties and inadequate data documentation, leading to frustrations in data reuse. The session emphasized the need for a common culture of data stewardship and ongoing efforts towards open access and sustainable data practices in Europe.