What an indicator actually does
An indicator is a function — bars go in, a drawing comes out. That's it. The function runs continuously as bars close, and the drawing updates. Useful indicators do one of three things well:
Yesterday's high, the floor-trader pivots, the Initial Balance. You'd mark these by hand; the indicator does it instantly, every session, without errors. Pure time saver.
Volume at each price (Volume Profile), net delta per level (Delta Profile), RVOL versus the rolling average. Data that exists in the feed but isn't readable on a plain candle chart.
ATM P&L in dollars and R-multiples, VWAP, standard-deviation bands around a session open. Math that's trivial on paper but impossible to do bar-by-bar in your head.
The ornamental ones
A rough filter: if an indicator's only output is a colored squiggle that lags price and fires signals after the move is already obvious, you can skip it. RSI, MACD, stochastics, their six hundred repackaged variants — they worked in the 80s because the instruments and market regimes were different. On ES or NQ intraday in 2026, they mostly produce noise.
The test: what does this indicator tell me that I couldn't figure out from the candles and volume alone? If the honest answer is “nothing,” it's ornamental. Delete it from the chart.
The three categories that matter
Useful indicators for ES/NQ day trading group into three buckets — the same three chapters on the indicator catalog:
Market structure
Where price is likely to react — gaps, levels, sessions, opening ranges. Answers “what's the setup?”
Volume & order flow
Who's in control at a given price — delta, volume distribution, VWAP. Answers “do I trust it?”
Context & execution
Is this participation above or below normal, is the move statistically extended, what's my P&L right now. Answers “what do I do?”
Together they form a complete read: structure tells you where, volume tells you who, context tells you when and how much. An indicator that doesn't slot into one of those three categories is probably ornamental.
Conceptual takeaways
- Good indicators automate, reveal, or compute. If it does none of those, it's decoration.
- Lagging oscillators are ornamental on intraday futures. Delete, don't defend.
- Useful tools fall in three buckets: structure, volume, context. Anything else is probably noise.
Next chapter: how to actually apply them — tuning, layering, and the workflow that keeps your chart readable.