I immigrated to the United States, how can I stock in the United States?

Immigrated to the United States, the way of stock trading:

In the United States, stock trading is similar to that in China, and stocks are traded through agents. For example, Scottrade company, users can pay to register in this company, and then trade stocks in Nasdaq and other American stock markets through this company.

Stock trading is to engage in stock trading. The core content of stock trading is to obtain profits through the price difference between buying and selling stocks in the securities market. The rise and fall of stock prices change with the fluctuation of the market. The fluctuation of stock price often shows the characteristics of differentiation, which stems from the concern of funds, and the relationship between them is like the relationship between water and ships.