"Poor data literacy" is the second biggest internal roadblock to success, as ranked by respondents to Gartner's third annual chief data officer (CDO) survey.
Various data statistics help you understand the data quickly
Understand what other related data exists to ensure you have found the right information
Various business units knows a lot about their data. Their knowledge and usage can help others tremendously
How the data is getting created, where it is used, what the origin is, etc.
... and many more tools like data comparison, metadata changes,
references help you understand the data