There are many mistakes you can make when you first get into visualization. Yan Holtz and Conor Healy catalog the common pitfalls as part of their project From Data to Viz. While there are a lot, keep in mind that you’ll learn these as you go. But it’s good to at least be aware of them from the start.
Collection of data visualization pitfalls
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Percentage of People Who Married, Given Your Age
Or, given your age, the percentage of fish left in the sea. Here’s a chart.