Technical indicators, explained — and how they actually relate

An indicator is arithmetic on past prices and volume — nothing more, and nothing shameful. It cannot see the future; it can describe the present so precisely that a written rule can act on it. That description job splits into four families, and the whole craft of using them well is knowing which family a tool belongs to. General information, as always — not advice.

Family 1 — Trend: which way, and how strongly

• Moving averages (SMA, EMA) — the average price of recent bars; the EMA weights recent bars more. Traders conventionally watch fast averages (20, 50) against slow ones (100, 200): price above a rising long average is the plainest description of an uptrend there is.
• MACD (12, 26, 9 by convention) — the gap between two EMAs, plus a signal line of that gap. It describes momentum of the trend: expanding histogram, trend leaning harder.
• ADX — trend strength, deliberately direction-blind. Readings below about 20–25 conventionally mean a weak or range-bound market regardless of which way price points.
• Donchian channels — the highest high and lowest low of the last N bars. Price escaping the channel is the definition of a breakout; no forecast involved.

Family 2 — Momentum: the speed of the move

• RSI (14 by convention) — compares recent up-closes to down-closes on a 0–100 scale. Traditionally read as stretched above 70 and below 30 — but the deeper use is divergence: price makes a new extreme and RSI refuses to follow, which says the push is losing fuel. It is a hint with famous false positives, never a signal by itself.
• Stochastic — where the close sits inside the recent range. Same family, same lessons, different arithmetic.

Family 3 — Volatility: how wild, and therefore how big

• ATR — the average true range: a typical bar’s travel distance. Its highest use is not a signal but a measurement: stops and targets sized in ATR adapt to the market’s temperament instead of a fixed pip number.
• Bollinger Bands (20-bar average ± 2 standard deviations, by convention) — a statistical envelope: price outside the band is stretched, which trend traders read as strength and mean-reversion traders read as rubber pulled too far.

Family 4 — Volume and anchors: who is participating

• Volume — participation behind a move; breakouts on heavy volume describe conviction, on thin volume, apathy.
• VWAP — the volume-weighted average price of the session: the institutional benchmark price of the day, and the anchor for band-based mean reversion.
• OBV — a running total of volume signed by the day’s direction, used to check whether flows agree with price.

How they relate: the rule that saves beginners years

Indicators from the same family are echoes; indicators across families are evidence. RSI plus Stochastic is one opinion said twice — both are momentum arithmetic on the same closes, so agreeing adds confidence, not information. Two thermometers do not make new weather. But a trend filter plus a momentum trigger plus a volatility-based stop measures three genuinely different things — direction, timing and size — and that is what a complete trade needs.

Two archetypes, built from the families

The trend stack — trade with the current: establish direction with a long average, demand strength with ADX, time the entry on a Donchian or channel breakout, put the stop a sane ATR distance away. This is not hypothetical: QUANTLAB’s trend candidate was exactly this shape — a Donchian breakout, gated by ADX above 20 and price above the 200-period EMA — and its documented history (a brilliant blind result retracted when an exit-bar lookahead was found, edge at entry roughly break-even) is the best free lesson in why the testing discipline matters more than the indicator list.

The mean-reversion stack — trade the snap back: price stretched to a statistical band, momentum confirming exhaustion (RSI deep in its scale), a candle closing back inside the band, size filtered by volatility so wild markets are skipped. The VWAP lab tested precisely this shape for fourteen documented iterations — band touch, close back above it, RSI under 40, body measured against ATR — and its journal shows the in-sample numbers flattering before honest walk-forward told the truth.

Notice the symmetry: the same tools support opposite strategies, because the families answer different questions. Bollinger stretch is evidence for a reversion trader and a breakout trader alike — what differs is the question asked and the risk taken if the answer is wrong.

Divergence, and other honest caveats

Divergence — price extends, the momentum indicator declines to confirm — is the most quoted cross-family relationship. It genuinely describes fading force; it also fires early against strong trends so reliably that pros treat it as a reason to pay attention, not a reason to click. The same restraint applies everywhere: overbought is not a sell command, an MA cross is not a prophecy, and no indicator survives being the whole plan. The plan is question → invalidation → size → exit; indicators only sharpen the questions.

Cheat sheet

Where these stacks came from and how they were judged: QUANTLAB, explained. How to know whether any combination has an edge at all: backtesting 101. What an edge is worth per trade: the expectancy calculator. How big to trade it: position sizing.

General information, not financial advice. Everything on BRYME Money is educational. Trading forex, crypto and derivatives involves substantial risk of loss and is not suitable for everyone. Past performance — including any published research — does not guarantee future results. Never trade money you cannot afford to lose.