Detailed Guide to Buying Stocks on the Internet. Covers Software and Platforms such as Tradeking, TD Ameritrade and More. Learn how to Buy Stocks Online. The world of finance may seem quite complex and confusing. Finance seems to have its own language that may appear intimidating to the average person. There are some very complex and complicated parts of the financial world. However, the basics like how to buy and sell stocks are not as complex as some people would make them seem. ©