How not to lose money in derivative trading in the stock market.

There is a lot of content for making money in the stock market. But there is less information regarding the above topic. I would like to add some points from my experience.

1. Never trade on someone’s opinion because there is no certainty in trading; it's all about probability.
2. Always use stop losses.
3. Always use a defined loss strategy.
4. Never change your trading style by looking at someone’s lucrative screenshots.
5. Never rely 100% on backtesting results.
6. Don’t take any trade without logic.
7. No course or tips can help you in making profits but surely making losses.
8. Invest money/time to learn fundamentals and how instruments work.
9. Treat it like a business, and loss is also a part of this.
10. Win big and lose less; that’s all you need."