"currencies are influenced by a broad set of factors, including central bank policy, interest rates, current account balances and other macroeconomic indicators." How exactly does each affect prices? What happens step by step?
It's a very broad topic, I suggest you pick a macro economics book or at least search the web for info.
Fear & greed. When someone does something that scares you, it creates selling(Fear). When they do something positive, it creates buying (Greed) Thats all you gotta worry about fear & greed.