Why you keep losing money with trading?

My usual trading system continues to fail, what should I do?

If a trading system built by myself often fails and causes losses, should I abandon this system and replace it with another one? Is there a stable and profitable trading system?

Dear Hui friends, how to solve the situation of small profits and big losses?

Can retail investors make a lot of money by trading? How can I earn it?

How to choose a platform, can copying or calling orders really make money?

I have been unable to set the stop loss in the transaction, how can I do a good stop loss?