Recently, I've noticed many people asking about foreign exchange trading. In fact, the world's largest financial product by trading volume is forex, far surpassing stocks, gold, and others. Especially in recent years, even those seemingly stable mature market currencies have started to fluctuate significantly, creating many opportunities.

When it comes to forex trading, many people's first reaction is to profit from the exchange rate spread. What is the exchange rate spread? Simply put, it's the difference in the exchange rate of the same currency at different times or through different channels. Traders predict the trend of exchange rates and profit by "buy low and sell high" or "sell high and buy low." For example, if you believe the Japanese yen will appreciate, you buy yen against the US dollar at a certain price, and after the exchange rate rises, you sell. The difference in between is your profit. The calculation is straightforward: profit = (closing price - opening price) × trading volume.

To profit from the exchange rate spread, there are actually several ways. The most stable is bank foreign currency fixed deposits, which have low risk and low barriers. You just need to open a foreign currency account at the bank, convert at the posted exchange rate, and deposit. US dollar fixed deposits are popular because of high interest rates and wide use, while yen fixed deposits are favored because Japanese interest rates are much higher than Taiwan dollars. However, fixed deposits mainly earn interest; if you truly want to profit from exchange rate differences, this method is somewhat inflexible since you can't buy or sell at will during the deposit period.

A medium-risk option is foreign currency funds, which combine currency and investment tools. Besides gains from exchange rate fluctuations, you can also profit from the growth of the underlying investments. For example, if you are optimistic about the yen appreciating and the Japanese stock market rising, buying yen-denominated Japanese equity funds can achieve dual profits.

The most suitable method for earning from exchange rate spreads is forex margin trading. This involves trading through contracts provided by brokers, with the main advantage being leverage to amplify gains. The forex market typically offers leverage from dozens to hundreds of times, so even small price movements can be magnified. For example, if the yen against the dollar moves from 161 to 141, and you catch this trend with leverage, your returns can be substantial.

Another benefit is low trading costs. Some forex platforms have spreads of less than 0.01%, far lower than banks' 0.3% to 0.47%. They also support T+0 two-way trading, allowing unlimited buy and sell transactions on the same day, providing opportunities to profit whether you expect the currency to appreciate or depreciate.

Regarding specific trading techniques, I’ve summarized several practical methods. Range trading is suitable when the market shows no obvious volatility, buying at support levels and selling at resistance levels. Trend trading involves capturing the market's strong direction and holding for the medium to long term, like the continuous appreciation of the US dollar from 2021 to 2022. Day trading is suitable for short-term traders, focusing on key moments like interest rate announcements or central bank decisions, which often trigger sharp exchange rate movements. Swing trading falls between day and trend trading, combining technical and fundamental analysis. Position trading is a long-term holding strategy, requiring little frequent operation but finding low-cost entry points.

Why choose to buy yen or other currencies to profit from exchange rate differences? First, forex has diverse uses—travel abroad, online shopping, trade—all require currency exchange. Second, the overall trend is relatively easier to grasp; understanding the interest rate policies and monetary policies of two countries can help predict exchange rate movements. Third, the forex market has the highest liquidity, with daily trading volume exceeding 6 trillion USD, high transparency, and low manipulation risk.

Timing for buying and selling currencies also matters. If trading through banks, transactions are generally only available during business hours (9 am to 3:30 pm), and weekends and holidays are off. However, forex margin trading has no central exchange and can be conducted 24 hours a day. The market is divided into four main trading sessions: London, Sydney, Tokyo, and New York. Due to overlapping hours, you can trade continuously from Monday to Friday without interruption.

Finally, my takeaway is that there is no absolutely best trading method. The key is to find a way that suits your risk preferences and trading habits. Whether buying yen to profit from spreads or trading other currencies, as long as you study the market carefully, you can find opportunities to make money. It’s recommended to practice on a demo account first, familiarize yourself with the trading process and your strategies, then enter with real funds.