Support, resistance & trendlines
Markets have memory: prices where crowds bought or sold before often matter again.
Builder · 10 min · Updated 2026-11-08
💡 Floor and ceiling of a room
Throw a ball in a room: it bounces off the floor and the ceiling. Support is the floor, where buyers have stepped in before. Resistance is the ceiling, where sellers have appeared. If the ball smashes through the ceiling, that ceiling becomes the floor of the room upstairs — this is called role reversal.
Why levels form
- Memory: traders remember where price turned before.
- Regret: holders who bought high wait to "get out at break-even", creating supply at old highs.
- Orders: limit orders and stop-losses cluster around obvious prices and round numbers ($1, $50,000).
Draw zones, not razor-thin lines
Price rarely turns at the exact same cent. Draw support and resistance as zones that cover the wicks and bodies of previous turns. A zone touched three or more times, on higher timeframes, with strong reactions, is more significant.
| Level quality | Weaker | Stronger |
|---|---|---|
| Timeframe | 5m / 15m | Daily / weekly |
| Touches | 1 | 3+ |
| Reaction | Small bounce | Sharp, high-volume reversal |
| Age | Very old, forgotten | Recent and visible to everyone |
Role reversal
When resistance breaks convincingly, it often becomes support on the way back down ("old ceiling, new floor"). Many traders wait for this retest because it offers a clear stop just below the level.
Trendlines
- In an uptrend, connect at least two higher lows; a third touch validates the line.
- In a downtrend, connect at least two lower highs.
- Do not force lines through candle bodies to make them "fit". If you have to cheat, the line is not there.
- Steeper lines break sooner. A broken trendline signals a slowing trend, not automatically a reversal.
Breakout or fake-out?
| Real breakout clues | Fake-out clues |
|---|---|
| Candle closes beyond the level | Only a wick pokes through |
| Volume ≥ 1.5–2× average | Low volume, often on weekends |
| Higher-timeframe trend agrees | Against the higher-timeframe trend |
| Holds on a retest | Quickly falls back inside the range |
🧮 Practical example: drawing a zone
Key takeaways
- Support = floor of demand; resistance = ceiling of supply.
- Draw zones, not lines; more touches on higher timeframes = stronger.
- Broken resistance often becomes support (role reversal).
- Real breakouts close beyond the level on strong volume.
- Trendlines need at least two, ideally three, touches.
Education only — not financial advice.