Scenario: On April 1 a portfolio was 100k and climbed to 140k by yesterday's close, then a day of stops reduced it to 130k. Is that a 7.14% loss today or a 30% gain for the month?
Treat each buy or sell based on its own price action. Stop checking portfolio value constantly as if money in open positions is already owned; frequent checks lead to emotional, sloppy execution when focusing on the whole instead of the individual parts.
If stock A is still performing well, it shouldn't be sold just because a small loss occurred on stock B. Exit B and let A run on its own merits. Emotional decisions driven by money ruin chances for real growth