What are essential rules for designing and producing plots?

Background:

Previously on Cross Validated, we have had questions on:

It was suggested by @david in the comments to this question that we should have a community wiki question with one visualization rule per answer that the community could vote on.

Question

What are the essential rules on designing and producing graphical representations of data?

Rules

  • One rule per answer
  • Ideally, include a brief explanation of why you think it is a good idea
  • Answers with examples (code and image) of good and bad practice preferred.

Answer

Substance over Form: Choose the appropriate plot, style, coloring or other graphical parameters to show what you want the plot to show, rather than what your graphing package necessarily allows.

Attribution
Source : Link , Question Author : Community , Answer Author :
Fomite

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