Mua thấp. Bán cao. Đừng bán khi hoảng sợ. Nghiên cứu phương pháp phân tích thị trường cơ bản và kỹ thuật. Xem xét đầu tư vào các công ty trả cổ tức.

Given the above summary, write a detailed text in English for it.
This means that when stocks are at a relatively low price based on past history, you buy them. Of course, no one knows for sure when the prices are going to go up or down—that’s the challenge in stock investing. To determine if a stock is undervalued, look at the company's earnings per share as well as purchasing activity by company employees. Look for companies in particular industries and markets where there's lots of volatility, as that's where you can make a lot of money. You want to sell your stocks at their peak based on past history. If you sell the stocks for more money than you bought them for, you make money. The bigger the increase from when you bought them to when you sold them, the more money you make. When a stock you have drops lower than the price you bought it for, your instinct may be to get rid of it. While there is a possibility that it can keep falling and never come back up, you should consider the possibility that it may rebound. Selling for a loss isn’t always the best idea, because you lock in your loss. These are the two basic models of understanding the stock market and anticipating price changes. The model you use will determine how you make decisions about what stocks to buy and when to buy and sell them.  A fundamental analysis makes decisions about a company based on what they do, their character and reputation, and who leads the company. This analysis seeks to give an actual value to the company and, by extension, the stock. A technical analysis looks at the entire market and what motivates investors to buy and sell stocks. This involves looking at trends and analyzing investor reactions to events.  Many investors use a combination of these two methods to make informed investment decisions. Some investors, known as income investors, prefer to invest almost entirely in dividend-paying stocks. This is a way that your stock holdings can make money even if they don't appreciate the price. Dividends are company profits paid directly to stockholders quarterly. Whether or not you...