I've been noticing for a while that many people enter the stock market without really understanding what they are buying. The truth is, not all stocks are the same, and this difference can significantly change your strategy as an investor.

Basically, when you buy shares in a company, you're acquiring a fraction of ownership. But here's the interesting part: companies can issue different types. The two main ones are common stocks and preferred stocks, and they operate in very different ways.

Common stocks are the classic type that most people know. They give you voting rights at meetings, so you have a say in important decisions like who runs the company. The dividends you receive depend on how well the company performs, so in good years you earn more, but in bad years you might get nothing. If the company goes bankrupt, you're among the last in line to recover your investment. The upside is that you have real growth potential if the company grows, and you can usually sell your common shares fairly quickly.

Preferred stocks work differently. Here, you don't have voting rights, but in exchange, you receive more stable dividends, usually fixed or with a pre-established rate. The good thing is that in case of financial trouble, you're paid before common stockholders. The tradeoff is that your earning potential is more limited, and these fixed dividends make these stocks behave more like bonds when interest rates go up or down.

Thinking about strategy: preferred and common stocks serve different profiles. If you're looking for predictable income and are close to retirement, preferred stocks make sense. You protect your capital, receive regular payments, and sleep more peacefully. If you still have time and can tolerate volatility, common stocks offer more long-term growth opportunities.

One thing I find relevant is to see how these two types behave in different contexts. A few years ago, when I looked at the S&P U.S. Preferred Stock Index compared to the S&P 500, the difference was notable. While common stocks rose nearly 58% over five years, preferred stocks fell around 18%. That shows how they respond differently to changes in interest rates and economic conditions.

If you're going to invest, the basic recommendation is not to put all your eggs in one basket. Mix preferred and common stocks according to your situation. Choose a regulated broker, analyze the companies you're investing in carefully, and review your portfolio periodically. You can also trade CFDs on these stocks if you prefer not to hold them physically, though that depends on your broker and the liquidity available.

In the end, understanding the difference between preferred and common stocks is fundamental to avoid mistakes. It's not just about performance; it's about aligning with your risk profile and financial goals. Some need stability, others growth. The key is to know what you need.