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How a proper trendline is built, what a channel tells you, and how to stay objective
Published by The Retail Trader · AUG 09, 2026 · Features
The trendline is the most subjective tool on a chart. Two people will draw two different lines on the same chart, and both will be able to call themselves right. That is why the real lesson of the trendline is not in its rules but in its discipline.
In an uptrend, connect the rising lows. In a downtrend, the falling highs. You need at least two points to make a line, and it is the third point that makes it valid.
A line can always be drawn through two points — any two points make a line. So a two-point trendline is not information, it is just geometry.
There is no single right answer to this. A line drawn through bodies shows less noise; a line drawn through wicks respects the true extremes.
What matters is only that you pick one method and stick to it. A trader who picks, each time, whichever method makes the line 'look like it works' isn't reading the chart — he is reading his own hope.
If a second line parallel to the trendline also touches price, a channel forms. A channel tells you the range within which the move is running.
Price failing to reach the upper line inside a channel is often the first sign that the trend is tiring — before the breakdown.
Three questions when a trendline breaks:
• On which timeframe did it break — a 15-minute line breaking and a weekly line breaking are not the same thing.
• How did it break — by slipping through on a small candle, or by being shoved through by a big one? The two mean different things.
• What was volume saying — a break without participation often reverses.
A trendline is drawn looking backward but used for what lies ahead. So drawing a line, taking a screenshot, and later checking for yourself whether it worked — this is a small habit that moves the trendline from illusion to tool.
And if you need to draw more than three lines on one chart before any structure shows up, then there is no structure.
This article is for educational purposes only — it is not a buy or sell recommendation, makes no claim of guaranteed returns, and is not advice. Rules, rates and mechanics are changed from time to time by the exchanges, SEBI and RBI, so verify every number yourself with your broker or an official source.