Expertise
Obviously, there is more to expertise than just acquiring the proper knowledge and skills. Expertise is based on a person's resources, natural talent, or biological endowment.
Expertise, itself, is a descriptive term. To describe is to add detail in the specific case to a more general definition. A description of expertise requires an inventory of what the expert knows, knows how to do, wants or intends to do, and what they do or achieve. Psychologically, knowledge and skills are mental or cognitive concepts. They are not material entities known by their physical makeup; they are states of mind. This fact makes them unscientific. Instead, they are pretty sound scientific concepts, known by their function, by the behavior potential they provide [Bourne Jr., L. E., Kole, J. A., & Healy, A. F., p. 1-2].
The areas in which experts excel are: generating the best solutions to problems, seeing relevant features of problems, spending time on accurate problem presentation, engaging in continual self-monitoring, choosing appropriate strategies, and retrieving relevant domain knowledge and strategies with minimal effort. Areas of possible limitations are that expertise is domain limited and that experts can be overconfident in their skills, inflexible, biased, or tend to gloss over detail [Ericsson, K. A., Charness, N., Feltovich, P. J., & Hoffman, R. R.. p. 148].
Bourne Jr., L. E., Kole, J. A., & Healy, A. F. (2014). Expertise: defined, described, explained. Frontiers. Retrieved from: https://www.frontiersin.org/articles/10.3389/fpsyg.2014.00186/full
Ericsson, K. A., Charness, N., Feltovich, P. J., & Hoffman, R. R. (2006). The Cambridge Handbook of Expertise and Expert Performance. New York: Cambridge University Press.