I’ve been identifying observations stuck at phylum Arthropoda, which is pretty fun. One can often get to a finer ID just by counting legs.
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6 legs = hexapoda, and most likely insecta. a lot of beetle and other larvae get identified as myriapods, it’s satisfying to correct those.
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8 legs = arachnida, and you can also probably get down to araneae if there’s silk involved
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many segments and lots of jointed legs usually means myriapoda. 2 pairs of legs per segment = diplopoda, 1 pair of legs per segment = chilopoda EDIT: I forgot about the weird, tiny, shorter ones: symphyla and pauropoda. But those are relatively rare.
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I don’t have any good tips for crustaceans, but isopods often get identified as another arthropod, so knowing what they look like is helpful.
There are also a lot of egg case observations and gall observations, which I’m not too good at, but I try to annotate those at least.
A few tricky things:
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pill millipedes and isopods are confusing, so be careful with those.
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some spiders mimic insects (especially ants) quite well, so make sure those “antennae” are not legs.
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sometimes arthropods lose legs, which can mess up your count.