Your indicator is a formula, not a signal

Open any platform and you'll find two hundred indicators, each with a reputation for "signals." Here is the uncomfortable summary: every indicator is a formula applied to past price — a moving average, a ratio, a count. It compresses history; it does not know the future. Traders who remember this use indicators well. Traders who forget it pay them tuition.

What an indicator can and cannot do

An indicator can do three useful things: describe regime (is this market trending or ranging?), measure extremes (how far has price stretched from its average?), and standardize a rule (turn "momentum looks strong" into a repeatable yes/no). It cannot predict reversals, anticipate news, or improve a trade whose stop and target are wrong. The Bollinger Bands are the clean example: the bands measure how far price sits from a moving average. Price riding the upper band is not "overbought" — it is strong. The band is a description wearing a prediction's costume.

The overfitting trap

The natural response to losses is to add conditions: an indicator to confirm the indicator, a filter to filter the filter. Each addition improves the backtest and worsens the future — you are curve-fitting a story to history. The test: if every rule can't be written in one sentence a stranger could follow, the system is a mood, not a method. Fewer inputs, held longer, beat decorated rules held briefly.

A workable way to use them

Give each indicator one job and write that job down. Example: a stochastic or RSI for timing inside ranges only; a moving average for regime only; volume or ATR for size context only. No tool gets to both define the setup and confirm it — that is the same vote counted twice. Whatever's in your stack, the indicator library ships the actual source files, so you can read what the formula really does before trusting what it claims.

The question to ask before adding any indicator

"What decision will this change tomorrow?" If the answer is "it will make me feel more certain," it's decoration. If the answer is "entries happen at band touches and nowhere else," it's a rule — testable, measurable, and honest. The market pays for decisions, not certainty. Keep the formulas that improve the decisions and retire the ones that only improve the mood.