Been diving into how professional traders actually make decisions, and it all comes back to understanding what are trading signals and how they work in real time. Most people think it's just gut feeling, but it's actually the opposite - good traders rely on data-driven systems.

So here's the thing about what are trading signals: they're basically your market compass. They analyze price action, volume, historical patterns, and economic data to tell you when to buy or sell. The genius part is they remove emotion from the equation. Instead of FOMO-ing into a position, you're following a mechanical system based on actual numbers.

I was reading about this from Marco Santanche, a quant strategist, and he made a solid point - the data sources for trading signals have evolved massively. Used to be just basic OHLCV data, but now institutional traders are digging into insider transactions, earnings forecasts, web traffic, even weather data. It's wild how much information is out there if you know how to process it.

Let's talk practical examples. MACD is probably the most popular one - it watches two moving averages, and when one crosses above the other, it signals a potential long position. Simple but effective. Then you've got RSI, which tells you when something's overbought or oversold. MA helps identify trends. Bollinger Bands show volatility. Fibonacci Retracement pinpoints support and resistance levels. Each one answers a different question about what are trading signals telling you.

Here's where most people mess up though - they backtest everything, find the best performer, and think they've cracked the code. Santanche points out that's actually a trap. Backtesting shows what worked historically, but it doesn't guarantee future performance. You can easily overfit your strategy to past data. The real move is understanding WHY a signal should work, not just that it DID work.

To avoid false signals, you need to either find mathematical solutions through optimization or test against synthetic datasets to see how your strategy holds up under different conditions. That's how you separate actual edge from lucky backtests.

The takeaway: what are trading signals ultimately about is converting raw market data into actionable decisions. If you're serious about trading, understanding these indicators and how to properly validate them is non-negotiable. Most retail traders skip this step and wonder why their strategies fail. Worth spending time on this foundation.