Charts
One have to watch the charts to see what other people are seeing.
They see the same patterns as you are. Knowing what they see helps to anticipate (but not predict - never try to predict future) their actions.
Just watching the charts with the mind clouded with emotional wishful thinking will inevitably result in heavy loses.
Studying of charting techniques, chart patterns and indicators is NOT so much for directly applying this knowledge, but for understanding what other people see and even think at this moment.