Stocks do t, which is the abbreviation of stocks trading on t+0 day. It refers to stocks bought on the same day and sold on the same day. It is an ultra-short-term operation, where t refers to the trading day. To do T is to make use of the rise and fall in a trading day to make a price difference. When the stock is seriously oversold or opens low, buy the same number of the same stock, wait until it rises to a certain level, and then sell the originally covered stock.