Who can tell me how can I earn quickly?

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Hi,everyone!I'm a new user,So I want to know how can I earn money quickly.And I also want to konw why mylot want to pay us the money when we have writeen some discussion?What the purpose? I found that someone take some strange and bored discussion,but there will be so many people reply the discussion.I don't konw why.And I even want to know what the most popular discussion.The war?the music?the film?or the food and so on.That's so strange and I think most of us like tmylot because of they are so free and want to kill time.Well,maybe someone will against me,I dont care.I just want you can give me the answer of my question.Thank you!