No much, or your professors were already rich lying on beach rather than still talking in classroom.

If you only buy and sell stocks, just do it to gain experience by the hard ways.

Statistic methods do help you to trade in a little more sophisticate way.

 You may look at ways of, say, trading pairs (buy one and sell another (or short futures)) to capture values and  also avoid risk of straight stock buying/holding.

That would be a start. You will know what you need to learn when you read a book about it. Hope this help you move forawrd

都是从一堆杂乱无章的数据中看出规律，可以借鉴！