Padding and margin have two different purposes. Padding is for spacing within elements. Margin is for spacing between elements. However, there's more to it!
When to use Padding and Margin. Small details really matter., by Sung Park, Sketchware
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Padding vs Margin: The Definitive Guide – UX Engineer
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Margin vs Padding. Margin is an element's personal space —…, by Kunal, Frontend Shortcut
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Padding vs Margin: The Definitive Guide – UX Engineer