Answer:
It means to be very good at something
" thoroughly proficient : EXPERT" - Merriam Webster
The title could be interpreted as a story about a man's dream and the confusion of was he dreaming or did that actually happen. Or it could be interpreted as a delusion a man had and he is having trouble figuring out the difference between reality or imagination.
Answer:
I will be very sad if you do that
Answer:
the purpose is to give attention to the good guy and then the bad one comes along and there is tension between the 2