Traffic determines what you can learn
Low-traffic pages may need large changes and longer test windows to detect reliable differences.
Small lifts require more evidence
The smaller the true improvement, the more data is generally needed to distinguish it from noise.
Avoid peeking decisions
Repeatedly checking and stopping when a favored variant leads can increase the chance of a misleading result.
Document the hypothesis
Even inconclusive tests can improve future decisions when the question and result are recorded clearly.