Student or Learner
I would appreciate if you could paraphrase or explain the underlined parts in the following sentnece.
( it is about peple who just have got a new job)
Besides the technical aspects of their jobs, they have to master the more shadowy features. "They have to learn bosses' expectation, corporate customs, the best sources for internal information and how to fit in.
the best sources for internal information and how to fit in = the best places to go/people to talk to when you want to get things done within the company, and how to behave like any other member of staff (rather than a newcomer or an outsider).
What the whole quote is saying is that new starters have to learn not only the technical details of their job but also how to fit in with the culture of the firm.