Whats the best online job to do without spending money first?

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There are many people on the internet who claim they can help you earn money, but they all seem to ask you to lay out money first. I, and I am sure millions of others, am very skeptical about spending out money to people I don't know. Does anyone know of good sites that you can earn a half decent amount and not have to pay them money first???? I am a student and just want to top up my income to help me get by!