A friend just asked me about GTC orders, and I realized that many traders still don't have a deep enough understanding of this tool. Today, let's talk about this topic.

Simply put, a GTC (Good Til Cancelled) order means that after you place it on the exchange, you can wait indefinitely until the price reaches your target, and then it will automatically execute. This is completely different from a day order—day orders are only valid for the trading day and are automatically canceled at the close. If you want to buy or sell at a specific price but don't want to monitor the screen every day, GTC is a good choice.

I had an experience before. I was bullish on a certain stock but thought that the current price of $55 was too high, and my target price was $50. Instead of checking the market every day, I directly placed a GTC buy order at $50. Two weeks later, the price really dropped to that level, and the order was automatically filled. This shows the convenience of GTC—helping you automate your trading strategy.

But here’s a key point: GTC orders are not permanent. Most brokers will automatically cancel your order after 30 to 90 days to prevent too many zombie orders from piling up in the system. So, you need to check your open orders regularly.

Now, let's talk about the risks. The biggest difference between GTC and day orders is here—GTC orders exist across multiple trading days, which means you might encounter unexpected price fluctuations. For example, a stock closed at $60 the previous day, but due to some sudden news, it gaps down to $50 the next day. If you set a GTC sell order at $58, you might end up selling at $50 instead of your expected $58. Market gaps are the biggest trap for GTC orders.

Another issue is that GTC orders execute automatically. It sounds very convenient, but it also means you lose the chance for manual judgment. Sometimes, short-term price fluctuations might trigger your order, but then the market rebounds. At that point, you might regret it—you should have waited.

In contrast, day orders don't have these problems. They are only valid within a single trading day and expire at the close. If you're doing short-term trading and pursuing quick price movements, day orders might be more suitable. But if you have a clear long-term target price and don't mind waiting weeks or even a month, GTC is a better tool.

My advice is to be disciplined when using GTC orders. Regularly check your open orders to ensure they still align with your current trading strategy. Market conditions change, and your plan should adjust accordingly. Don’t let an order placed three months ago get executed inexplicably today.

Overall, GTC vs. day orders each have their uses. The key is to understand their differences and choose based on your trading style. If you need more professional advice, it's best to consult an experienced trading advisor.