The rise was because of hype that was generated due to media attention to bitcoin, and that was initially because of bitcoin's price skyrocketing. So the rise in bitcoin's price is actually sort of a positive feedback loop that involves bitcoin price and media coverage.

Nothing to do with China banning ICOs. Reason it fell so quickly was because that China essentially out of the blue decided to ban ICOs without prewarnings.  These things can't be taught in books because they can't be known before the actual announcement gets released.

 I don't think that you need to worry about the fall too much though. BTC is comfortably rising up once again, and i think we shall make a near full recover soon.