Trend lines and channels
Learning objectives
Define a trend by its structure rather than by the line you draw on it
Draw a trend line consistently and explain why two touches prove nothing
Use a channel to produce the invalidation level and the plausible target your risk rules need
A trend is structure, not a line
What is technical analysis? said the second thing to learn is structure: the levels and trends price has actually respected. A line drawn on price is closer to the market than any calculation performed on it.
BUT before you draw anything, you need to know what you're looking for.
An uptrend is a sequence of higher highs and higher lows. Price advances, pulls back without giving up all the ground, then advances further.
A downtrend is lower highs and lower lows. The mirror image.
Neither is present when highs and lows sit at roughly the same levels. That's a range, and it's a genuinely different condition rather than a trend waiting to happen.
That sequence is the trend. The line you draw is only a way of describing it, and this ordering matters more than it sounds. Most beginners draw a line first and conclude there's a trend because the line exists. Establish the higher highs and higher lows first. If you can't point to them, no line will supply them.
Drawing the line
In an uptrend, connect the lows. The line runs beneath price and acts as rising support.
In a downtrend, connect the highs. The line runs above price and acts as falling resistance.
Then the rule that separates a useful line from a decorative one:
Two points define a line. Three points suggest it means something.
Any two points on any chart can be connected. That is a property of geometry, not evidence about the market. What makes a line worth attention is price arriving at it a third time and reacting, because that's the first moment the line has predicted anything rather than described something.
Until the third touch, you have a hypothesis. Treat it as one.
Wicks or bodies
A real question with no correct answer.
Connecting wicks captures the full extremes price reached, including the ones it immediately rejected.
Connecting bodies captures where price actually settled, ignoring brief spikes.
Both are defensible and experienced traders disagree. What matters is that you choose one and apply it the same way every time, because a trader who switches method between charts is fitting lines to what they already believe. Consistency is what makes your own results interpretable across a block of trades.
The subjectivity problem
Here is the honest part, and it should change how you use the tool.
Give the same chart to ten traders and you will get ten slightly different trend lines. All of them defensible. None of them the correct one, because there is no correct one.
Three consequences follow.
A trend line is a zone, not a price. Treat it as an area where something may happen, not as a level accurate to the pip. Anyone drawing conclusions from price being three points above a line has forgotten that a slightly different starting point would have moved the line further than that.
Hindsight makes every chart obvious. Look backwards and you will always find a line that held beautifully, positioned exactly where it worked. How to read a candlestick chart warned about this with patterns and it applies more strongly here, because a line has two free parameters to adjust rather than a fixed shape.
If you have to squint, it isn't there. A trend line requiring you to ignore two touches and accept a third that's roughly close is not describing anything. The obvious ones are the ones other participants are also looking at, which is most of why they work at all.
Channels explained
A channel adds a second line parallel to the first, on the other side of price.
Ascending channel: rising support beneath, parallel resistance above. Descending channel: falling resistance above, parallel support below. Horizontal channel: a range, with roughly level boundaries.
The value is that a channel gives you two things instead of one.
The near boundary is where the trend is invalidated. The far boundary is somewhere price has repeatedly travelled to, which makes it a plausible target rather than an invented one.
That combination is the entire payoff of this lesson, and it connects directly to the risk framework. Stop losses: where to set them and why needs a level at which your reason for the trade stops being true. Take profits and risk-reward ratio needs a target the market plausibly reaches, and warned that moving a target further away to improve a ratio on paper is manufacturing a number rather than finding a trade. A channel supplies both from the chart, which is precisely what What is technical analysis? claimed was technical analysis's honest job.
Once you have both, Risk per trade: the 1% rule and position sizing turns the distance between them into a position size. Nothing further is required.
Breaks explained
Price will eventually go through the line. Two things to get right.
Wait for a close beyond it. A wick through a trend line is not a break. How to read a candlestick chart made the general point and it applies exactly here: a candle mid-formation can look like anything, and price pierces lines briefly all the time before returning.
Don't put your stop on the line. This is where everyone's stop sits, which as Stop losses: where to set them and why explained makes it a natural place for price to reach before reversing. Place it beyond the line, accept the slightly wider distance, and reduce your position size accordingly.
False breaks are common enough that a strategy of entering on every break of every line will lose money to them steadily.
Three things the line tells you beyond direction
Angle matters. A very steep trend line describes a rate of ascent that cannot continue indefinitely. It will break, and often not because the trend ended but because the pace merely slowed. Steep lines are fragile and a break of one means less than a break of a shallow one.
Duration matters. A line respected over months has more participants watching it than one drawn this morning. Its break is more significant for the same reason.
Timeframe matters. A daily trend line is seen by far more of the market than a five-minute one. Match the timeframe to your style, as Trading styles: scalping, day, swing and position set out, and give more weight to lines on the higher one.
One technical note that trips people up: on a log scale the line is different. For a long-running chart or a volatile instrument, a trend line drawn on linear pricing and the same line drawn on logarithmic pricing can diverge substantially. Pick a scale and stay on it.
When they fail
Trend lines describe trends. In a range they produce a stream of lines that break immediately, in both directions, because there is no underlying structure for them to describe.
That's the same failure condition Introduction to indicators: moving averages and RSI identified for moving averages, and for the same reason. Both tools assume direction exists. When it doesn't, both generate signals continuously and none of them mean anything.
Recognising which condition you're in matters more than how carefully you draw.
Key takeaways
A trend is a sequence of higher highs and higher lows, or lower highs and lower lows. The line describes that structure and cannot substitute for it
Two touches prove nothing, since any two points make a line. The third touch is the first evidence the line predicts rather than describes
A trend line is a zone rather than a precise price, because a slightly different starting point moves it further than most people's margin of error
A channel supplies both an invalidation level and a plausible target, which is exactly what your stop and your risk-reward calculation need