Answer:
There are at least three key concepts you need to understand when starting a data project:
Data requests should begin with a list of questions you want to answer.
Data often is messy and needs to be cleaned.
Data may have undocumented features.
Explanation:
In many ways, working with data is like interviewing a live source. You ask questions of the data and get it to reveal the answers. But just as a source can only give answers about which he or she has information, a data set can only answer questions for which it has the right records and the proper variables. This means that you should consider carefully what questions you need to answer even before you acquire your data.
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