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The page Wikipedia:How to create graphs for Wikipedia articles gives some technical information about how to create graphs for Wikipedia (in particular, which programs and format to use). This text also deals about how to create graphs, but in the sense of what to plot.
I started writing this page a while ago, but just copied it here after seeing Image talk:Mauna Loa Carbon Dioxide-en.svg and the related page Wikipedia:Don't draw misleading graphs. I am glad to see that someone else is interested in this topic, and I hope it'll motivate me to add more content (to this page or the page mentioned earlier).
Do not expect too much from it since,at the moment, it is only a list of ideas and references.