did you use adsense for feed on you blog or website?

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Truly i like making money on the internet but most of the time when i come across something which i don't understand i like to ask people so that i will not fall in victim of it, some months back i submitted my blog and luckily the approve it, now i made just $10 but anytime i open my blog to edit or post new content google always display it at the top of my page to take the advantage of ads for feed but i don't really understand how it work. Can anyone tell me how google ads for feeds work?