Here you have some tutorial: http://www.tutorialspoint.com/obiee/index.htm
I think you'll find most of the basics.
To learn how to use OBIEE start to use it and have extensive documentation in which you have everything.
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I think the.first.thing that you have to know is.about the approach of oracle bi, there is an article.inside oracle competency center, which is.part of the OPN, oracle.give a learning path for all product inside that you could get all the theory that you has.
Check.some articles about multidimensional modellingGenerating a Multi-Dimensional Model
And finally check all the technical potential of.obiee.
Hope this help.