blog for money...?

So I was googling "ways teens can make money" just now (no idea why. I have a job.), and apparently I can earn money by blogging. So my question is, how does it work exactly? I got one of the links, and I don't get it at all. Well, theoretically, I get it. I mean, Blogger even has a link to monetize the blog. But then, of course, you have to set up an ad-sense account and yadda yadda yadda, with a lotta hassle that's not exactly worth the time, so I'm not gonna do it that way. Or do it at all, maybe. But oh well. It's worth the thought. I guess.