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Starting from scratch—Learn Bollinger Bands step by step, practically!!
Bollinger Bands are a classic technical analysis tool. Their basic logic and common usage are as follows:
**Basic Composition:** Consists of three lines. The middle line is usually the 20-day simple moving average (SMA). The upper line equals the middle line plus twice the standard deviation, and the lower line equals the middle line minus twice the standard deviation. The upper and lower lines expand and contract automatically with market volatility, showing a “breathing” characteristic.
**Trend Judgment:** When the middle line is rising and most price movements are between the middle line and the upper line, it usually indicates an uptrend. When the middle line is falling and most price movements are between the middle line and the lower line, it usually indicates a downtrend.
**Range-bound (Sideways) Market:** When all three lines are flat, and the price drops near the lower line, you can look for a low-buying opportunity; if the price rises near the upper line, consider taking profits (selling). This is suitable for swing trading.
**Reversal/Breakout Signals:** When Bollinger Bands become very narrow (tight range), it often indicates a balance between bullish and bearish forces, and this balance may break. This is often followed by a breakout in either direction (lines opening). It’s an important point to watch for reversal or breakout moments.
**Precautions:** In a strong trend, the price may continue moving along the upper/lower line. Do not mechanically trade against the trend just because the line is touched. It is recommended to combine indicators such as volume, MACD, and RSI to filter false signals and manage risk properly.
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