How do you blog?

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How do you blog? What sort of things do you write about in a blog? I swear if I knew how, I would probably be making some serious money blogging. Another thing, how do you get paid for blogging. I mean who pays you? Can someone out there elaborate on blogging for me please. I always see posts in here about people making money blogging, but I don't quite understand how. So can someone in the know please let me know. All I know is that blog is short for weblog and that's it.