Trading Indicators Explained: Trend, Momentum, Volatility and Volume

Module 6B: Indicators · Lesson 1 of 10 · Back to course

Open almost any trading platform and you’ll find a menu with over a hundred indicators. Social media is full of people claiming one of them is the “secret”. It isn’t. Every indicator is just a formula applied to past prices (and sometimes volume). It can help you see what price has already done more clearly. It can’t tell you what price will do next.

This module goes through the indicators you’re most likely to meet: RSI, MACD, Bollinger Bands, ATR, VWAP, Stochastic, CCI and Keltner Channels. Then it covers divergence and, most importantly, why using fewer indicators usually beats using more. This first lesson gives you the big picture.

What an indicator actually is

An indicator takes data you can already see on the chart – usually the open, high, low and close of each candle – and runs it through a formula. The result is plotted either on top of the price (an overlay, like a moving average or Bollinger Bands) or in a separate panel underneath (an oscillator, like RSI or MACD).

That’s all it is. No indicator has access to information the chart doesn’t already contain. It re-presents price in a way that makes one feature – direction, speed, range or participation – easier to see.

The four families of indicators

Most indicators fall into one of four groups. Knowing the group tells you what question the indicator is answering.

Family	The question it answers	Examples	Covered in
Trend	Which way is price generally moving?	Moving averages, MACD	6B.3 MACD
Momentum	How fast is price moving, and is that speed fading?	RSI, Stochastic, CCI	6B.2 RSI, 6B.7 Stochastic & CCI
Volatility	How big are the price swings right now?	ATR, Bollinger Bands, Keltner Channels	6B.5 ATR, 6B.4 Bollinger, 6B.8 Keltner
Volume	How much trading is behind the move?	VWAP, volume bars	6B.6 VWAP

A useful rule of thumb: if two indicators come from the same family, they usually tell you the same thing in a slightly different way. Putting RSI, Stochastic and CCI on one chart isn’t three opinions – it’s one opinion repeated three times. We come back to this in Lesson 6B.10.

Why every indicator lags

Because indicators are calculated from past prices, they always react after price has moved. A 20-period moving average on a 1-hour chart is an average of the last 20 hours. By the time it turns up, price has usually already been rising for a while.

You’ll sometimes see indicators described as “leading”. Usually that means an oscillator such as RSI can show momentum fading before price turns. That can happen, but momentum can also fade and price can keep going. It’s still a calculation on the past, not a forecast.

There’s always a trade-off:

• Shorter settings (for example a 5-period average) react quickly but give lots of false signals (“noise”).
• Longer settings (for example a 200-period average) are smoother but react slowly, so signals arrive late.

There’s no setting that gets you early and reliable signals. Anyone selling “optimised settings” is usually showing you settings that happened to fit the past.

Settings: why the defaults are fine

Most indicators come with default settings – 14 for RSI and ATR, 12/26/9 for MACD, 20 and 2 for Bollinger Bands. These defaults aren’t magic, but they’re what most traders and most platforms use, and they make it easy to compare notes and follow lessons like these.

As a beginner, stick to the defaults. Changing settings until an indicator “works” on the last few weeks of a chart is called curve-fitting, and it’s one of the most common reasons a method looks great in hindsight and fails going forward. We cover it in Module 12 (Backtesting).

How traders actually use indicators

Used sensibly, indicators do one of three jobs inside a written trading plan:

1. Filter: “I only look for buys when price is above the 50-period moving average.” The indicator decides which trades you’re allowed to consider, not when to take them. See the Moving Average Pullback Strategy for an example.
2. Context: “ATR is twice its normal level today, so I’ll use a wider stop and a smaller position.” The indicator describes the conditions you’re trading in.
3. Trigger: “I enter when MACD crosses above its signal line.” Triggers are the weakest use for beginners, because they invite you to trade every cross, and lagging crosses produce lots of losing trades in sideways markets.

What indicators should not be is a replacement for a plan. Price, support and resistance, and your risk rules come first. Indicators sit on top.

Common mistakes

• Indicator hunting. Swapping indicators after every losing trade. Losing trades are normal; changing tools after each one means you never test anything properly.
• Stacking the same family. Three momentum oscillators agreeing doesn’t make a trade three times more likely to work.
• Treating labels as instructions. “Overbought” doesn’t mean “sell”. “Oversold” doesn’t mean “buy”.
• Ignoring price. Watching the panel under the chart instead of the chart.
• Tweaking settings to fit the past. See curve-fitting above.
• Forgetting costs. A signal that looks profitable on a chart can be wiped out by spreads and overnight financing (see Lesson 1.3).

Example: one chart, three questions (illustrative numbers)

All numbers below are made up for teaching purposes. They’re not real prices or a trade idea.

Imagine the FTSE 100 on a 1-hour chart:

• Price is 8,240, and the 50-period moving average is 8,205. → Trend question: price is above its average, so the recent direction is up.
• RSI(14) reads 68. → Momentum question: recent gains have outweighed recent losses by a fair margin. It doesn’t tell you the move is about to end.
• ATR(14) is 22 points, against a typical 15 points over the last month. → Volatility question: swings are bigger than usual, so a stop that would normally be fine may be too tight.

Each indicator answers a different question. None of them says “buy” or “sell”. A trader with a written plan would combine these answers with their own rules, risk limits and the levels on the chart – and might well decide to do nothing.

The prop firm angle

Prop firm challenges have hard limits – typically a daily loss limit and a maximum overall drawdown (see Lesson 1.4 and Module 15). Indicators can’t help you hit a profit target, but two uses are directly relevant to staying inside the rules:

• Volatility indicators (especially ATR) help you size positions so that a normal day’s swing doesn’t push you towards the daily limit. We go through the maths in Lesson 6B.5.
• A trend filter can stop you taking lots of trades against the main direction, which is a common way challenge accounts run into drawdown.

Be wary of “prop firm indicators” sold online with claims about pass rates. No indicator changes the fact that most people who buy a challenge don’t pass it.

Key takeaways

• An indicator is a formula applied to past price (and sometimes volume). It can’t see the future.
• The four families are trend, momentum, volatility and volume. Indicators in the same family largely repeat each other.
• All indicators lag. Faster settings give more false signals; slower settings give later ones.
• Stick to default settings while you learn, and use indicators as filters or context, not as automatic buy and sell buttons.

Quick quiz

1. What’s the difference between an overlay and an oscillator? (An overlay is drawn on the price chart itself; an oscillator is drawn in a separate panel, usually within a fixed range.)
2. Which family does ATR belong to? (Volatility.)
3. Why don’t RSI, Stochastic and CCI together give you “three confirmations”? (They’re all momentum oscillators built from the same price data, so they largely repeat each other.)
4. What’s the trade-off between short and long indicator settings? (Short settings react faster but give more false signals; long settings are smoother but slower.)
5. Name the three jobs an indicator can do inside a trading plan. (Filter, context and trigger.)

Key terms

Indicator · Overlay · Oscillator · Lagging indicator · Momentum · Volatility · Curve-fitting · Also see Trading jargon in plain English.

Try this

On a free charting account or your demo platform, open a 1-hour chart of the FTSE 100 or GBP/USD. Add a 50-period moving average, RSI(14) and ATR(14) with default settings. For five different candles, write down what each indicator is telling you about trend, momentum and volatility – in words, not “buy” or “sell”. Then remove everything and look at the bare chart. How much of that could you see without the indicators?

FAQ

What is the best indicator for beginners? There isn’t one. Each answers a different question. A simple moving average for trend and ATR for volatility cover most of what a beginner needs; the rest of this module explains the others so you know what you’re looking at.

Do professional traders use indicators? Some do and some don’t. Many use a small number as filters or for risk, rather than as entry signals.

Can an indicator tell me when to buy? No. It can describe what price has done. Decisions should come from a written, tested plan with fixed risk.

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Disclaimer: This page is general education, not financial or investment advice or a personal recommendation, and it doesn’t take your circumstances into account. Examples are hypothetical, for illustration only, and not an invitation to buy or sell. Learning a strategy doesn’t guarantee profits. Past performance is not a reliable guide to future results. Futures, spread bets and CFDs are complex and carry a high risk of losing money quickly because of leverage, and most retail traders lose money. With a real futures account, losses can exceed your deposit. Only trade with money you can afford to lose, and speak to an independent FCA-authorised adviser if you’re unsure. Read our full risk warning.