You can get pretty far with data graphics with just limited statistical knowledge, but if you want to take your skills, resume, and portfolio to the next level, you should learn standard data practices. Of all places, UK Parliament has some short and free guides to help you with basic statistical concepts. They provide 13 notes, each only two or three pages long that can help you with stuff like how to adjust for inflation, confidence intervals and statistical significance, or basic graph suggestions [pdf]. I like.
Statistical literacy guides for the basics
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Giving Up Time as a Parent
There is a fixed number of minutes during the day. Where do parents usually draw the time from?
Divorce Rates for Different Groups
We know when people usually get married. We know who never marries. Finally, it’s time to look at the other side: divorce and remarriage.
Who Earns More Income in American Households?
Compared to 1970, a shift towards women making the higher income.