I've been in such situations as well, when you simply don't know what diagram, chart or graph to use in some certain situations. Sometimes it's not only technical issues, but also depends on your specific needs during online courses, for example, when you want to explain some information about big data to the audience, but not sure how to produce it in a proper way. Recently I could find an article on Preply website with nice explanations about how to describe graphs, charts and diagrams in your specific presentation. It's pretty useful resource I should say.
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