To those who care to share, what are your biggest trading golden nuggets

I know most people do not like to share their strategies and I completely respect that.

This question is for those who enjoy sharing small pieces of wisdom, the kind of golden nuggets or secret sauce that do not give away an edge but still make a real difference. Often it is not a full system but a mindset, habit, tool or lesson learned the hard way.

So to anyone who cares to share, what is a golden nugget from your trading journey that helped you improve or avoid common mistakes? Insights that could genuinely help others who are learning. Thank you to everyone willing to contribute.