A couple of "Key Levels" you can watch each trading day.

Plot these levels on your chart and see how the market reacts to them.

Overnight High and Low
Previous Day Close
Gap fill from Previous Day Close to Today's Open
Premarket levels prior to the US open
Five min Opening Range
Initial Balance

These may be used for breakouts or rejection points, based on current market price action

Not trading advice. Do your own research.