How to get ads to my website and blogs to get some revenue?.....

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I have more than 6 blogs in English and other languages... I filled them up with useful data to viewers.... Now i want to popularize and get ads for the sake of income.... I have seen "adhitz" in some sites and blogs to get money..... I haven't any idea of getting ads to my blog... Please let me know the ways of getting ads from other sites to get a revenue...