If you have a look at the website you will find some pretty ok tutorials that explains the basic stuff for you, then you have the documentation, take a look at the PDF files, they contain a lot of useful information.
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How to get access to E-learning
Need some help about the basic knowladge of OpenCascade.Don`t know how to learn it
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If you are willing to pay for it:
http://www.opencascade.org/support/training/elearning/