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The most important skill in data analysis isn‘t knowledge — it's instinct. A small discrepancy that you can't see at a glance. Learning not to miss that subtle "something feels off" moment is the first step to genuinely using Excel as a tool. Look at the table on the left by itself, and all you see is a column of numbers. Your brain can't process that as meaningful information. Turn the whole picture into a chart. Now you notice it: the trend is generally going up, but it's jagged. That's your