how can you earn money through blogging such as blogspot?

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I have noticed that most of my friends here in mlylot have their blogspot and those serve as a source of extra money. Will anyone teach me how to earn money through blogspot? the detailed one please. I would really appreciate tho help. As you have read my past posts, I am broke and I really need money. so desperate.. tsk tsk tsk! thanks fellas! Love, attente