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Count the valence electrons you can have for the molecule, determine how many you've used. If you used too many, you create a double/triple bond and it can be on either side of the central element between the other elements that are the same as each other (ex. NO2) (resonance structures). The amount of resonance structures is the amount possibilities you can place the double/triple bond between the central element and the other element. I hope this makes sense :).
I don’t think knowing the possible resonance structures would be important. Working through some of the practice exams I got didn’t see any questions where they asked to draw all resonance structures or asking how many possible ones there are. So far I have been drawing the most stable Lewis structure and if the question states how many there are then I would answer it. Hope this helps.
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