A practical guide to mainstream technical indicators
How SMA, EMA, RSI, MACD, Bollinger Bands, ATR, VWAP, OBV, ADX, and Stochastic work — what each one tells you, and the pitfall most people miss.
- There are no good or bad indicators, only the right indicator for the question you are asking.
- Most charts can be summarized with four dimensions: trend, momentum, volatility, and volume.
- Lagging indicators describe state. Bounded oscillators describe stretch. Volatility indicators describe size.
- No single indicator is a strategy. The value comes from combining one from each family and treating disagreement as a real signal.
Most professional dashboards reduce a chart to a small number of reads across four dimensions. Picking one indicator per dimension covers more ground than stacking three momentum oscillators on the same panel.
Trend
Where is the medium- and long-term drift pointing? Answered by moving averages and ADX.
Momentum
Is the move accelerating or running out of steam? Answered by RSI, Stochastic, and MACD histogram.
Volatility
How big should today's range be? Answered by ATR and Bollinger Bands.
Volume / participation
Is the move confirmed by real flow? Answered by VWAP/VWMA and OBV.
Stylized examples of what each indicator family actually looks like on a chart. Real data is messier, but the shape of the signal is the same.
Trend - moving averages and the golden cross
Price rises above a faster SMA, which then crosses above the slower SMA.
Momentum - RSI in its 0-100 channel
Each row below collapses an indicator to four things: which family it belongs to, the formula in one line, what it actually tells you, and the pitfall most people miss.
| Indicator | Family | Formula | What it tells you | Common pitfall |
|---|---|---|---|---|
| SMA Simple Moving Average (SMA) | Trend | SMA_n = (P_1 + ... + P_n) / n | Smooths price by averaging the last n closes. SMA50 and SMA200 are canonical medium/long-term trend filters. | Lags by design. Treat it as a regime filter, not a timing signal. |
| EMA Exponential Moving Average (EMA) | Trend | EMA_t = alpha * P_t + (1-alpha) * EMA_(t-1) | Weights recent prices more heavily, so it turns faster than SMA. |
A working setup might be: SMA50 + SMA200 for regime, MACD or RSI for momentum, ATR for stop sizing, and VWAP or volume for confirmation. When all four agree, the read is high-conviction; when momentum and trend disagree, that disagreement is itself the signal: wait, or size down.
Indicators are not magic. They are compressions of price and volume that make a chart easier to discuss. Pick one indicator per dimension, learn its specific failure mode, and let disagreement between dimensions be the thing that slows you down before a trade.
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