If you have no friends in the Oracle community, see if there is a local chapter of OAUG (Oracle Applications Users Group). The OAUG's purpose is to educate users. If your company is interested in using Oracle, they may want to send some personnel to training at Oracle University or attend an Oracle webinar on the subject.
You could also take Oracle University classes in GL (General Ledger), AR (Accounts Receivable) or AP (Accounts Payable). Some of these classes are available online, if your company or you cannot afford instructor-led classes.
If you are primarily interested in the programming/technical aspects of the financial applications, you may wish to pursue education in the Oracle developer's area... such as programming forms and reports, or using PL/SQL. If this is what you want, you may want to start with an class in relational database modeling, introduction to SQL or PL/SQL, and then an introduction to forms class. Again, these are available at Oracle University, or sometimes in evening classes at your local university.
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