The course covers subjects like Standard Operating Procedures (who does what, when), safety procedures, interaction with cabin crew, handling of dangerous goods, low vis and extended range operations. The last three are fairly standard but the rest can be quite diverse.
Another element of initial training, which I am much less fond of, is the concept that the new pilot has forgotten every first detail about the aeroplane and needs to do a condensed type rating all over again. This might apply to some people (who really should have brushed up on their own beforehand) but it would be far more efficient for the airline to do a triage based on recency before arbitrarily sending everyone for training which is an expensive waste of resources.
Finally you get the regulatory hassle of operating in a new country which feels the need to exert it's sovereignty by altering the standard ICAO regulations slightly and making pilots write exams which have already been written during training - usually air law. Did I also mention the ludicrous licensing fees, or the need to do a new medical?
S.