guide
How Many Trades Do You Need Before You Trust a Strategy?
There is no universal magic trade count. The useful question is how much independent evidence you have, how noisy the outcome is, and what decision you are trying to justify.
Topic
statistics
2 published pieces on this subject.
article
Win Rate vs. Expectancy: Why More Winning Trades Can Still Lose Money
A high win rate feels reassuring, but the size of wins, size of losses, and trading costs determine whether the process has positive expectancy.