5 Popular Indicators Explained in 5 Minutes (Part 1)

There are hundreds of technical indicators, but most traders use a small handful. Understanding those few well pays off more than collecting dozens without knowing what they're for. In this first part, we cover the five most popular: moving average, RSI, MACD, Bollinger Bands and Stochastic. The second part covers volume, ATR, Fibonacci, Ichimoku and OBV.

For each one, we show what it measures and what it actually showed on the Ibovespa, using real daily quotes (Yahoo Finance) between April and October 2026.

What each indicator measures

1. Moving average

It's the average of the last N closes, recalculated with every candle. It shows the overall direction: price above a rising average signals an uptrend; below a falling average, a downtrend. The 20-period tracks the short term; the 50-period, the medium term; the 200-period, the long term.

2. RSI (Relative Strength Index)

Compares the average of gains with the average of losses over the last 14 periods, on a scale of 0 to 100. Above 70 signals overbought; below 30, oversold. It shows the strength of the move, not the exact turning point.

3. MACD

It's the difference between the 12- and 26-period exponential moving averages, with a signal line (a 9-period average of the MACD itself). The MACD crossing above the signal line signals the pace is turning bullish; below, bearish.

4. Bollinger Bands

A 20-period average with two bands set two standard deviations away. Narrow bands show a calm market; wide bands, an agitated one. A strong squeeze of the bands often precedes a big move, without telling you the direction.

5. Stochastic

Shows where the close sits within the range between the high and low of the last 14 periods, from 0 to 100. Above 80, the price closes near recent highs; below 20, near recent lows. It reacts faster than the RSI and so generates more signals, including false ones.

Real example: the Ibovespa in 2026

The chart shows the Ibovespa with the 20-period Bollinger Bands. The index closed at 187,953 points on April 1, 2026 and at 204,302 on October 7, up 8.7%, with a drop to a low of 164,835 on August 14 in between. Each indicator told part of the story:

50-period average: direction, and July's back-and-forth

From May 7 to July 9, the Ibovespa closed every day below the 50-period average; on June 1, for instance, it was at 172,198 points with the average at 184,833. In July, however, the index crossed the average five times in eight sessions (July 10, 16, 17, 20 and 21). In a directionless market, the moving average generates signals that cancel each other out.

Stochastic: oversold that lasted

On August 7, the Stochastic's %K fell to 4.5 with the index at 172,513. Anyone who bought there on the oversold signal watched the Ibovespa fall a further 3.6%, to 166,335 on August 18. The %K stayed below 20 for more than a week.

MACD: one hit and one miss

On August 25, the MACD crossed above the signal line with the index at 174,577; ten sessions later it was at 185,629, up 6.3%. On September 22 it crossed below at 187,423, and ten sessions later the index was at 205,835, 9.8% higher. The same signal was right once and wrong the other time.

RSI: overbought with no drop

On September 8, the RSI reached 79.3 with the index at 187,367. The biggest closing pullback in the following weeks was to 182,991 on September 28, and in October the index passed 200,000 points.

Bollinger: the squeeze before the explosion

On September 30, the gap between the bands fell to 2.91% of the average, the smallest in the window. On October 5, the Ibovespa rose 7.7% in a single session, from 192,115 to 206,912 points, closing well above the upper band. From the close of September 30 (186,340) to October 5, the gain was 11.0%.

These cases describe what happened, not what's going to happen.

How to use the five indicators together

Different speeds

Moving average and MACD are slow and confirm moves already underway. RSI and Stochastic are fast and show excesses. Bollinger shows the state of volatility. That's why it's normal for them to disagree on the same day.

A common combination

Use the moving average for direction, an oscillator (RSI or Stochastic, not both) for the entry point within that direction, and the MACD or the Bollinger Bands to confirm momentum.

Chart timeframe

The default parameters (20, 14, 12/26/9) were designed to work on any timeframe, but the reading changes. On the daily chart, a MACD crossover can take weeks to confirm; on the 5-minute chart, several show up per day. Before trading on a short timeframe, check what the same indicators show on the daily chart: the bigger timeframe's direction usually carries more weight.

Limitations

All five are calculated from past price. They lag during sharp reversals, know nothing about news, and generate false signals in a sideways market, like the 50-period average in July.

Common mistakes with the classic indicators

• Buying just because the Stochastic or RSI entered oversold, without checking the direction.
• Using RSI and Stochastic together thinking one confirms the other: the two measure almost the same thing.
• Treating a Bollinger Bands squeeze as a bullish signal: it signals a move, not a direction.
• Following every moving-average crossover in a sideways market.
• Changing parameters after every wrong signal.

On a demo account, add one indicator at a time to the chart of the asset you follow and, for a few weeks, note every signal and what the price did in the following days. Only then combine two or three. The record shows more about each indicator than any definition.

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