What kind of 'human foods' can hermit crabs eat?

I just got a pair of hermit crabs, and I was wondering what things they SHOULD eat, what they CAN eat, what they LIKE to eat, and what they SHOULDNT eat.

I mostly want to know what they like to eat and shouldn't eat.

APART FROM HERMIT CRAB FOOD, OF COURSE. IM NOT STUPID.

haha:)
Update: Thanks for all the info, it really helped!!:)
Can they eat bacon, just out of curiousity...?
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