Metadata is usually called "data about data" and can be used to document research data. [This document][1] provides a brief introduction to metadata and some guidelines for developing metadata.
Topics include the following:
- What is metadata, and what does it have to do with research data?
- How do I create comprehensive metadata?
- Ten questions and guidelines for developing comprehensive metadata
- Additional resources
[1]: https://osf.io/7q4cu/