I don't know if this is in general or specific. If you want to use SAP FICO, you have to take SAP FICO training. It is not an intuitive system at all. If you know basic accounting, then Financial training will be easier than without that knowledge. SAP FICO has to follow accounting rules. Having an FI foundation will help you in other areas of SAP as well since accounting works with the results of all business processes.