I need to understand the representation theory of $S_n$ (symmetric group on $n$ letters) and so could someone suggest a good reference for this. There is a similar question on mathoverflow here

A learning roadmap for Representation Theory

Most of the responses to the above question give references for representation theory of Lie groups. Also the usual reference Fulton and Harris has too many exercises (on which I don't want to spend too much time ) and I find it difficult to read.

Another reference which was suggested was Flag varieties by Lakshmibai and Brown. I did look up the chapter on representation theory of $S_n$ and it was very nice to start with, till I hit a point where they used some terminology without defining it. (I could be more specific about this if someone can help)