Our expert says:
giving your account details is probably the safest way, as cheques may bounce. But I would check out thoroughly how you are protected from handing over goods and then not getting paid for them as this could be a scam where 'imaginary' buyers offer to buy your goods, you send the goods off and then never see any money.
Check it out carefully before you go ahead, and involve your parents in checking things out - despite what some teenagers think they do know a thing or two!! Also if your gut feeling is to be nervous about this, which from your question sounds that way then don't do it.
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