12 Technical Indicators Every Investor Should Know
Complete guide to the most important technical indicators: RSI, MACD, Bollinger Bands, VWAP, OBV, and more. Learn what each indicator tells you about a stock.
Why Technical Indicators Matter
Technical indicators are mathematical calculations based on price, volume, and open interest data. They help traders and investors identify trends, momentum, volatility, and potential reversal points. While no single indicator is perfect, combining multiple indicators provides a more reliable signal — which is exactly what AI analysis tools like Kasiel do automatically.
RSI (Relative Strength Index)
RSI measures the speed and magnitude of price changes on a scale of 0-100. Readings above 70 suggest a stock is overbought (potentially due for a pullback), while readings below 30 suggest it's oversold (potentially a buying opportunity). RSI is most useful when it diverges from price action — if a stock makes a new high but RSI makes a lower high, it's a bearish divergence warning.
MACD (Moving Average Convergence Divergence)
MACD tracks the relationship between two moving averages (typically 12-period and 26-period EMA). When the MACD line crosses above the signal line, it's a bullish signal; crossing below is bearish. The histogram shows the strength of the trend. MACD is excellent for identifying trend changes and momentum shifts.
Bollinger Bands
Bollinger Bands consist of a middle band (20-period SMA) and upper/lower bands set 2 standard deviations away. When price touches the upper band, the stock may be overextended; touching the lower band suggests it may be oversold. Band width indicates volatility — tight bands (a 'squeeze') often precede explosive moves.
VWAP (Volume Weighted Average Price)
VWAP is the average price weighted by volume throughout the trading day. Institutional traders use VWAP as a benchmark — buying below VWAP and selling above it. When a stock is trading above VWAP, buyers are in control; below VWAP, sellers dominate. It's one of the most important indicators for understanding institutional activity.
OBV (On-Balance Volume)
OBV tracks cumulative volume flow — adding volume on up days and subtracting on down days. Rising OBV with rising price confirms an uptrend. If price is rising but OBV is flat or declining, it suggests the rally may not be supported by volume and could be fragile. OBV divergences are powerful early warning signals.
ATR (Average True Range)
ATR measures volatility by calculating the average range between high and low prices over a period (typically 14 days). Higher ATR means more volatility. ATR is crucial for position sizing — use it to set stop-losses at a multiple of ATR to avoid getting stopped out by normal price fluctuation.
Moving Averages (SMA & EMA)
Simple Moving Averages (SMA) and Exponential Moving Averages (EMA) smooth price data to identify trends. The 50-day and 200-day moving averages are the most watched. A 'golden cross' (50-day crossing above 200-day) is a major bullish signal. A 'death cross' (50-day crossing below 200-day) is bearish. EMAs react faster to recent price changes.
Fibonacci Retracements
Fibonacci retracement levels (23.6%, 38.2%, 50%, 61.8%) identify potential support and resistance levels during pullbacks. After a strong move, prices often retrace to one of these levels before continuing the trend. The 61.8% level is considered the most significant — a stock holding above it during a pullback is generally bullish.
Combining Indicators for Better Signals
No single indicator is reliable on its own. The most powerful signals come from multiple indicators aligning — for example, an oversold RSI reading, a bullish MACD crossover, price touching the lower Bollinger Band, and rising OBV all occurring together. This is where AI tools excel: they can monitor all indicators simultaneously and identify these high-probability convergence patterns.
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