A small real body near the top of a candle and a long lower wick describe an intraperiod rejection. They do not, alone, describe a useful bullish reversal. Calling every such shape a hammer removes the market story that gives the name meaning.
Begin with what came before
A hammer is discussed after a decline because sellers have already controlled the swing. If the same shape appears halfway through a sideways range, it may merely show two-way trade. First mark the visible sequence of lower highs and lower lows. Then ask whether price has reached prior demand, an old breakout area, or another level participants may defend.
Read the close, not only the wick
The lower wick shows that price traded down and recovered. Where the candle closes reveals how much ground buyers reclaimed. A close near the high generally carries a different message from a weak close near the midpoint. Compare the body and wick with recent candle ranges; a dramatic shape on an unusually quiet bar may deserve less weight.
Require the market to continue the argument
Confirmation can mean a close above the hammer high, a successful retest, or a break of nearby minor structure. Choose the condition before later bars appear. The hammer low often supplies a logical invalidation reference, but execution and risk decisions remain personal and must account for slippage and instrument behaviour.
Practice by collecting ten apparent hammers: five at meaningful locations and five in undistinguished range space. Hide later candles, write a conditional reading, and only then reveal the outcome.
Practice note: mark the candle only after noting trend, nearby support or resistance, and the level that invalidates your reading.