Welcome to ETO, ronjohn.
Like many technical professions these days, especially involving electronics and related component sophistication, the finer points of electronics are of little use.
Electronics repair, irrespective of the genre, has been for some time a "board level" swap repair routine. There is no real need to know how a particular component group "works", rather its an understanding of that individual board's function (PS, amplfier, mixer, monitor interface, whatever) that matters.
So choose electronic courses that define "Block" functions in electronic devices.
Board (i.e., component) level repair is exceedingly rare, primarily because it is not cost effective.