Blog?

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I am new at the whole making money online thing. I have tried several scam sites and then found mylot. I like this site alot and am very satisfied with it. I am wondering though about the whole blog thing. How do people get paid for having a blog? I am confused I guess because I thought a blog was just like a diary type thing about a certain subject. could somebody please explain to me anything and everything they know about blogs? Thank You!! :)