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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Relationship Status Geography
Some places attract young singles, whereas others attract married couples and families. I was curious how this varied across the country, so I mapped it.
What Qualifies as Middle-Income in Each State
The meaning of “middle-income” changes a lot depending on where you live and your household size.