Licenses allow you to choose how your data and documents can be reused.
For data we recommend Open Data Commons Attribution License (ODC-by) which allows others to use, modify, and share your data but must cite your data when doing so (i.e., if someone uses your data for an analysis in a publication, they must cite your data).
For accompanying documentation, we recommend you examine the Creative Commons Licenses to choose which is most appropriate for you. For a great summary of what they all mean, check out https://foter.com/blog/how-to-attribute-creative-commons-photos/.