Trendline
30-Second Definition
A diagonal line drawn on a chart connecting a series of higher lows (in an uptrend) or lower highs (in a downtrend) to visually represent the current market direction.
Why It Matters
Trendlines are one of the most basic and widely taught technical analysis tools. They provide a simple, visual representation of the current market momentum. By connecting the swing points, a trader can easily see if the market is accelerating upward, bleeding downward, or trapped in a sideways range.
However, in modern algorithmic trading, trendlines serve a dangerous dual purpose. While they help identify the trend, they also create highly obvious diagonal support/resistance levels. Because retail traders are universally taught to buy the “third touch” of a trendline, these lines become massive pools of liquidity. Smart Money will often intentionally respect a trendline to build up retail orders, only to violently sweep the trendline (breaking it) before continuing in the original direction.
Visual Explanation
Real Trading Example
The EURUSD pair is in an aggressive uptrend. A trader draws an ascending trendline connecting the initial low to the first major pullback (Higher Low).
Two days later, the price pulls back again and perfectly taps the trendline for a third time. Millions of retail traders see this textbook “third touch” setup and instantly buy, placing their stop losses directly below the trendline.
Smart Money sees this massive build-up of liquidity. Instead of bouncing cleanly, the price suddenly crashes through the trendline, dropping 30 pips and triggering every single retail stop loss. Once the retail liquidity is absorbed, the market violently reverses and rockets 150 pips upward, continuing the macro trend but leaving the trendline buyers behind.
Common Mistakes
Common Mistake
Forcing the Line: Amateurs will often draw trendlines that slice through the bodies of multiple candles just to make the line “fit” their bias. A valid trendline should cleanly connect the extreme wicks of structural swing points without bisecting price action. If you have to force it, the line doesn’t exist.
Professional Tips
Pro Tip
Use Trendlines for Bias, Not Entry: Professional traders use trendlines to confirm the macro market direction, but they rarely use the touch of the line as their actual entry trigger. Instead, they wait for price to reach the trendline, look for a lower-timeframe Change of Character (CHOCH) or a true Order Block near that zone, and enter based on institutional footprints rather than the diagonal line itself.
FAQ
How many touches do you need for a valid trendline?
A minimum of two points (a starting low and a higher low) are required to draw the line. The third touch is generally considered the confirmation of the trendline’s validity.
Are trendlines useless in Smart Money Concepts (SMC)?
No, they are highly useful, but for the opposite reason. SMC traders look at pristine retail trendlines to identify where the retail liquidity is resting (Inducement). They anticipate the trendline being broken (swept) and look to enter trades after the retail breakout traders are trapped.
Do you draw trendlines on the wick or the body?
For strict structural mapping, it is best practice to connect the extreme tips of the wicks. The wicks represent the absolute highest and lowest prices traded during that period and are the true structural boundaries of the market.
Related Concepts
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