Anyone knows anything about selling ebooks and clickbank?

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I heard many people are also earning well by selling ebooks online. I'm not so familiar with this type of online money-making scheme, so I want to know if anyone of you give me some insights, feedbacks and pointers on how to start making money by selling ebooks. I'm not sure if I'm correct, but is clickbank also connected with selling ebooks? And if yes, how do I make use of my clickbank account to start making money selling them? ( I remembered I already made a clickbank account a few months ago without knowing much about it, but now wanted to know why it's popular and how to earn from it ).