What is best affiliate marketing products that works?

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Besides than Ptc, the most popular way of earning is of course by selling product online, but most of us includes me doesn't see what is actually a good products. Affiliates programme offers variety of products under their programme but which type of products that really sells and brings good money? thru some of my research selling e - books is the most popular products that sales now a days,or any other product that doesnt have hassle of shipping,tax,etc.. how can i learn how to market specific product to specific target market? Can anyone who have experience in affiliate marketing share some opinion on how can i also do this to earn more money online?