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Well to become an expert you just have to do some training and then work a long time with the product ;-).
Oracle university gives courses http://education.oracle.com/pls/web_prod-plq-dad/ou_product_category.getPage?p_cat_id=172
or you can start with some self education at http://www.oracle.com/technetwork/developer-tools/apex/application-express/apex-getting-started-1863613.html
If the question is answered please change it to answered.