I've been involved in trading for a while, and there's something everyone should understand from the beginning: what is PnL in finance and why it can completely change the way you trade.

PnL stands for Profit and Loss, basically your gain or loss on each trade. It sounds simple, but most novice traders don't even take it seriously. They open positions, close them, and move on without analyzing anything.

What I've learned is that understanding what PnL is in finance is not just a nice number on your screen. It's your compass. It shows you exactly how you're really performing, without self-deception. When you look at your PnL honestly, you see whether your strategy works or if you're just lucky.

Here's the important part: controlling your PnL is what allows you to make adjustments. If you see that you're losing money consistently, you need to change something. If you're winning but your losses are huge compared to your gains, you have a risk management problem.

It took me years to understand this, but the difference between an amateur trader and one who truly makes money is this: it's not about winning all the time. That's impossible. It's about making your gains larger than your losses in the long run. That's all.

Without monitored PnL, you're betting blindly. With it, you're making decisions based on real data. Risk management is what separates those who last in this from those who disappear after losing everything. So, if you want to improve in trading, learn to read and manage your PnL as if it were the most important thing, because honestly, it is.