Overfitting: The Silent Killer of Trading Strategies

I've been thinking a lot about edge in a crowded market and I keep coming back to one crucial aspect: overfitting. It's easy to get caught up in backtesting a strategy that performs well on historical data, but if it's not robust enough to withstand market fluctuations, it's doomed to fail. I've seen this happen to many traders, including myself. What are your thoughts on how to avoid overfitting and ensure your strategy is truly robust?