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It depends really - because different areas of Finance will use different areas. For example, not all your Finance users may need training in Subledger Accounting.
For general application usage, a "cheat sheet" is often useful. Maybe produce something which incorporates the shortcut keys (https://ebizportal.wordpress.com/2008/03/06/shortcut-keys-in-oracle-ebs-forms/ ) general navigation, how to do things like submit/monitor concurrent requests etc.
Keep it simple and short though. I find too much material is actually counter-productive sometimes.