Candlestick basics: what each candle is telling you

A candlestick is the most information-dense way to draw a single period of trading, and learning to read one is like learning to read a face — with practice you stop seeing lines and start seeing mood. Each candle is a tiny battle report: it tells you where the fight opened, how far the bulls pushed, how far the bears pushed, and crucially, who was left standing at the close. Master the grammar of a single candle and the patterns built from them stop being shapes to memorise and become sentences you can read.

Anatomy: body and wick

Every candle has two parts, and the distinction between them is the whole game.

• The body is the thick rectangle between the open and the close. A body that closes above its open is typically drawn hollow or green (a bullish session — buyers won); one that closes below its open is filled or red (a bearish session — sellers won). The body's length shows how decisively one side won.
• The wicks (or shadows) are the thin lines poking out above and below the body, reaching to the high and the low. They mark how far price travelled during the session before being pushed back — the ground that was taken and then lost by one side.

The key insight is that the close is where conviction settled, and the wicks show where it was rejected. A long upper wick means price pushed high during the session but sellers forced it back down before the close — buyers tried and failed. A long lower wick means price fell hard but buyers fought it back up — sellers tried and failed. The wick is a record of a failed attempt, and failed attempts are often the most revealing thing on a chart.

The doji: a session of indecision

When a candle's open and close are almost the same price, the body shrinks to a thin line and you get a doji — a cross-like candle that's all wick and almost no body. Its meaning is straightforward: the session was a draw. Buyers and sellers fought all day and ended roughly where they started. Neither side won.

A doji is most interesting not for itself but for where it appears. After a long, strong uptrend, a doji can signal that the relentless buying has finally met equal selling — the trend's momentum may be stalling. After a sharp downtrend, a doji can hint that selling pressure has been matched by buyers for the first time. The doji doesn't say 'reverse now'; it says 'the balance just shifted toward even — pay attention'. It's a question mark, not an answer.

Hammer and shooting star: rejection candles

Two of the most-watched single candles are essentially the same shape pointing in opposite directions, and both are stories of rejection.

• A hammer has a small body near the top and a long lower wick (and little or no upper wick). Appearing after a decline, it says: sellers shoved price way down during the session, but buyers came in with force and drove it back up to close near the high. Lower prices were rejected. It hints — only hints — that selling may be exhausting.
• A shooting star is the mirror image: a small body near the bottom and a long upper wick, appearing after a rise. It says: buyers pushed price up, but sellers slammed it back down to close near the low. Higher prices were rejected. It hints that buying may be running out of steam.

Notice the logic is identical to support and resistance — these candles are a single session's worth of the same supply-and-demand rejection, drawn in miniature. A hammer is essentially a one-day support test made visible. Understanding why the shape means what it means, rather than memorising 'hammer = bullish', is what separates reading a chart from reciting flashcards.

Engulfing: a decisive handover

Where a doji is one candle and a hammer is one candle, an engulfing pattern is a two-candle story of one side decisively overwhelming the other. A bullish engulfing is a small down-candle followed by a large up-candle whose body completely 'engulfs' the previous one — buyers didn't just win the second session, they erased the entire prior session's loss and then some. After a downtrend, that's a forceful shift in control. A bearish engulfing is the reverse: a small up-candle swallowed by a large down-candle, suggesting sellers have seized control after a rise.

The caveat that must always follow

Now the warning, and it applies to every single candle pattern above: a single candle, on its own, is weak evidence. A hammer in isolation is a curiosity, not a buy signal. Candle patterns become meaningful only in context — where they appear in the larger trend, whether they form at a known support or resistance zone, and whether volume confirms them. A hammer at a major support level on heavy volume is worth noticing. The identical hammer floating in the middle of nowhere on thin volume is just a candle.

How to actually use candles

Put together honestly, candles are best used as a confirming layer on top of the more durable concepts — trend and support/resistance — not as standalone signals. The sensible sequence is to first identify where the important levels and the dominant trend are, and then let candle shapes tell you about the crowd's psychology as price arrives at those places. A bullish reversal candle at a well-tested support zone, with volume backing it, is the candle doing its proper job: adding a layer of confirmation to a setup that already made sense for other reasons.

Used that way, candles are genuinely useful — a fast, intuitive read of who's winning the immediate fight. Used the other way, as a stream of standalone buy and sell triggers, they're a slot machine with extra steps. The shapes are the same; the discipline around them is everything.