There are 3 attunements. First one attunes you to this energy and teaches you how to do healing with it. Second one strengthens the energy. And in the third one you are taught how to pass these attunements.
Please make sure you are attuned to Reiki before taking this course. You need that, so that your healing channels are opened.
The course includes attunements, the manuals (by email), and the certificate.