From stock market to options trading to mutual funds, investment related terms and concepts that form the basis of winning investment strategies and each of modules are systematically explained. So select the modules of your choice and give your portfolio the edge of knowledge. The SEC’s office of Investor education and Advocacy is issuing this Investor bulletin to help educate investors about the different types of orders they can use to buy and sell stocks through a brokerage firm. The following are general descriptions of some of the common order types and trading instructions that investors may use to buy and sell stocks.