Identifiers, what parts of organisms are helpful for identification?

https://forum.inaturalist.org/t/helpful-tips-and-resources-for-beginner-plant-inatters-and-common-beginner-mistakes/28824
https://forum.inaturalist.org/t/presentation-how-to-photograph-plants-and-more-by-lena-struwe-and-peter-nitzsche/15143
etc.
For most big groups you can think of there’s likely already a topic on how to photograph them for ids.

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