I just realized that many people do not fully understand the hammer candlestick, one of the most important candlestick patterns in technical analysis. Not only used for cryptocurrencies, this pattern is also widely applied in stock trading, indices, bonds, and Forex.

Its operation is quite simple. Each candlestick on the chart represents a specific period of time — if it's a daily chart, then each candle is one day; if it's a 4-hour chart, then each candle is 4 hours of trading. Each candlestick has an opening price, a closing price forming the body, along with vertical lines (shadows) showing the highest and lowest levels during that period.

What does a hammer look like? It has a small body and a long vertical line at the bottom, at least twice the size of the body. This long line indicates that sellers pushed the price down initially, but then buyers raised the price above the opening level.

There are two types of bullish hammer candles. The first is the regular hammer — formed when the closing price is higher than the opening price, showing that buyers controlled the market until the end of the session. The second is the inverted hammer — when the opening price is lower than the closing price, with a long upper shadow indicating that buyers tried to push the price higher but ultimately failed. Although the inverted hammer is less clear than the regular hammer, it still serves as a bullish reversal pattern appearing after a downtrend.

On the bearish side, there are two corresponding patterns. The hanging man is the "bearish hammer" — when the opening price exceeds the closing price, forming a red candle, with a long lower shadow indicating selling pressure. The shooting star is the bearish inverted hammer — resembling an inverted hammer but signaling a reversal to the downside, forming when the opening price is higher than the closing price, with a long upper shadow suggesting the uptrend may be ending soon.

Using the hammer candlestick for trading requires paying attention to the pattern's position relative to the previous and next candles. Depending on the context, the reversal pattern will be confirmed or rejected. A bullish hammer appearing after a downtrend signals a potential reversal to the upside, while a bearish hammer (hanging man or shooting star) appearing after an uptrend indicates a possible reversal to the downside.

However, it must be acknowledged that the hammer candlestick has both advantages and disadvantages. Its advantage is that it is suitable for identifying potential reversal points in any market and can be applied across various timeframes. The downside is that this pattern depends heavily on context — there is no guarantee that a reversal will occur, and the hammer alone is not very reliable.

I also want to highlight the difference between the hammer and Doji. Doji looks like a hammer but has no body — it starts and ends at the same price level. While the hammer indicates a potential reversal, Doji often suggests consolidation, trend continuation, or indecision. The gravestone Doji resembles a hammer with no body, and the tombstone Doji is similar to an inverted hammer or shooting star.

In conclusion, the hammer candlestick is a useful tool but not a definitive buy or sell signal. It is more effective when combined with other tools such as moving averages, trend lines, RSI, MACD, Fibonacci retracements, and proper risk management techniques. Always use stop-loss orders to avoid significant losses during high volatility periods.