It's not that hard on compost vs recycle vs landfill.
Recycle: plastic w/ symbol #1 through 6, clear paper, aluminium and glass.
Compost: if it was alive recently (plant or animal), or soiled cardboard/paper (pizza box), or says compost (7)
Landfill: everything else.
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Permitted items for compost and recycling vary quite a bit by region. For example, in Toronto:
toronto.ca/services-payme
toronto.ca/services-payme
They switched to explicitly asking for many plastic items not marked with symbols like plastic bags because they can often recycle it.
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They don't accept black plastic, partly due to a special kind of institutional incompetence:
cbc.ca/news/canada/to
"[Toronto's] optical sorting technology at the recycling facility cannot distinguish black plastic from the black conveyor belt, and as a result can't sort it,"
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There are bunch of things not falling into either recycling or compost categories that aren't supposed to be put in the garbage. I think most people throw out batteries, etc. despite that because dealing with it properly is very inconvenient.
toronto.ca/services-payme
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They handle electronics handled separately too:
toronto.ca/services-payme
The rules are fairly complicated overall. Some systems are simpler but usually because they don't try to recycle as much or avoid hazardous waste in landfills. The black plastic thing is ridiculous though.