A newly hired internal auditor is most likely to need further education in the area...

A newly hired internal auditor from a different industry would most likely need further education in the area of business acumen. This need arises because business acumen includes understanding the specific business context, industry practices, competitive environment, and operational processes that are unique to the industry in which the organization operates. Transitioning between industries often requires adjustments and additional learning to understand these new dynamics effectively.

Institute of Internal Auditors (IIA) - Learning and Development Standards