Line, bar and candlestick charts — and choosing a timeframe

A chart is just a way of drawing the same raw fact — what people paid for a stock over time — and the way you draw it quietly decides what you'll notice and what you'll miss. Before you can read a chart you have to understand what's actually being plotted, and there's surprisingly little to it. For any chunk of time — a day, an hour, a minute — the market leaves behind exactly four numbers, and almost every chart you'll ever see is built from them.

OHLC: the four numbers behind everything

For any period, the market records four prices, known together as OHLC:

• Open — the first traded price of the period.
• High — the highest price reached during the period.
• Low — the lowest price reached during the period.
• Close — the last traded price of the period. This is the most watched of the four, because it's where the crowd settled when the music stopped.

That's it. A daily chart of a year is just 250-odd of these four-number snapshots laid side by side. Everything fancy — candles, patterns, indicators — is computed from these four numbers and the volume that went with them. Once you see OHLC as the atom of all charting, the different chart 'types' stop looking like rival philosophies and start looking like what they are: different amounts of those four numbers chosen to be shown.

Three ways to draw the same truth

The three common chart types are a ladder of increasing detail, each trading simplicity for information.

• Line chart — connects only the closing prices into a single line. It throws away the open, high and low entirely. Brutally simple, it's superb for seeing the big-picture trend without distraction — and useless for seeing what happened inside each period.
• Bar chart (OHLC bar) — a vertical bar from the period's low to its high, with a small tick on the left marking the open and one on the right marking the close. It shows all four numbers compactly, though many people find it fiddly to read at a glance.
• Candlestick chart — the same four numbers as the bar, but drawn as a 'body' between open and close with thin 'wicks' stretching to the high and low. The body is filled or coloured to show whether the close was above or below the open. It's the most popular type today because the eye reads it instantly.

We'll spend the next chapter entirely on candlesticks, because they carry the most information per glance and because their shapes form the vocabulary of price action. But don't dismiss the humble line chart — when you want to see whether something is, at the largest scale, going up or down without your eye being distracted by daily drama, the line chart is often the clearest tool there is.

Timeframes: the same stock, many different stories

Here's where beginners most often tangle themselves up. The same stock looks completely different depending on the period each candle represents — and crucially, the trends can point in opposite directions on different timeframes at the same moment, with neither being 'wrong'.

• Intraday (1-minute, 5-minute, 15-minute, hourly candles) — each candle is a slice of a single day. This is the world of short-term traders, and it is dominated by noise, order-flow and the fast players.
• Daily — one candle per trading session. The workhorse timeframe for swing traders and most investors checking a stock; long enough to filter intraday noise, short enough to be timely.
• Weekly (and monthly) — one candle per week or month. These strip away nearly all the noise and show the dominant, durable trend. A long-term investor often learns more from a single weekly chart than from a week of staring at five-minute candles.

A stock can be in a roaring multi-year uptrend on the weekly chart, a messy correction on the daily chart, and a sharp bounce on the hourly chart — all true simultaneously. None of them contradicts the others; they're describing different-sized waves on the same sea. The mistake is to look at one timeframe and believe it's the trend. There is no single trend. There's a trend per timeframe, and which one matters depends entirely on how long you intend to hold.

Multiple-timeframe analysis

The disciplined way to use this is multiple-timeframe analysis: deliberately look at a higher timeframe to establish the dominant context, then drop to a lower one for detail or timing. A common-sense ordering is to let the bigger picture rule and the smaller picture refine.

1. 1Start on a higher timeframe (say weekly) to answer: what is the dominant trend, and where are the major levels? This is your map.
2. 2Drop to a middle timeframe (daily) to see how the current move fits that bigger context — is the stock pulling back within an uptrend, or breaking down?
3. 3Only then, if you're timing an entry, glance at a lower timeframe for detail — while never letting the small picture override the big one.

The danger of zooming into noise

Now the warning that this whole chapter has been building toward. The shorter the timeframe, the higher the ratio of noise to signal. A one-minute candle is almost entirely random jostling — the momentary push and pull of orders, with barely any durable information in it. Zoom in far enough and you are no longer studying the market; you are studying static, and your pattern-hungry brain will cheerfully manufacture meaning out of it.

There's also a structural reason longer timeframes are kinder to a beginner: the faster you go, the more directly you're competing with co-located algorithms and professional intraday desks who will out-react you every single time. The weekly chart, by contrast, rewards patience and judgement — qualities you can actually develop — rather than reaction speed you can never match. As a rule of thumb, use the longest timeframe consistent with your actual holding period, and resist the pull toward faster ones. It almost always leads somewhere expensive.