How to make money from ClickBank?

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Did any of you know how to earn from ClickBank? As what I know is you have to join them to become their affiliate and then to sell or promote their product, if you success to sell any product, you will earn commission. But can anyone of you share your idea how to make this happen? I find that it is quite difficult to promote and sell the product online. Hope any kind hearthed member can teach us how to earn from ClickBank. Thank you.