Start with understanding the basic principle of CRA - "meeting the need for credit services in the community". CRA is all about how well you do that and how you measure it. The next step would be to educate about the "performance context" factors that are the primary determinants of your CRA rating. If you are a large bank, you should review the 3 tests and their subcomponents. If you are an ISB, you should review the lending test and community development test. A small bank needs to know the elements of the lending test.
If you would like to discuss ideas, just pm me. I've run CRA training sessions for many banks, so I can give you some direction.
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CRA Exam Preparation, CRA Performance Evaluations, Key Performance Benchmarks, & maps