Support and resistance
Levels the price has bounced from, role reversal and false breakouts.
Support is a zone where declines have repeatedly stopped because demand appeared there. Resistance is a zone where rallies stopped because of supply.
Levels are zones, not exact lines: the reaction prices differ a little each time.
After a breakout, resistance can become support and vice versa. A breakout after which the price quickly returns is called a false breakout.