This document discusses different types of stock trade orders: 1) Market orders execute at the market price at market close and can be risky if placed early in the day before prices are set. 2) Limit orders specify the maximum (buy) or minimum (sell) price and only execute at or within that limit. 3) Short selling "bets" that a stock price will decrease by borrowing shares and selling them immediately, with the goal of buying them back later at a lower price to cover the short position and make a profit.