In short: a stock market chart shows how a price moved over time, and reading one comes down to four things: time frame, price, volume and context. Charts describe the past. They help you see trends and risk, but they are not a forecast.
Step 1: Choose the time frame
The same stock can look like it is rising on a one-year chart and falling on a one-week chart. Always check the time axis first and match it to your question: day trading uses minutes, long-term investing uses months or years.
Step 2: Read the price
- Line chart: connects closing prices. Simple and good for trends.
- Candlestick chart: each candle shows the open, high, low and close for the period. A filled or red candle closed lower than it opened; a hollow or green one closed higher.
- Log vs linear scale: on long charts, a log scale shows percentage moves more fairly.
Step 3: Check the volume
Volume bars at the bottom show how much traded in each period. A breakout on heavy volume carries more information than one on a quiet day. Low volume means fewer participants and less reliable signals.
Step 4: Look for structure
| Concept | What it means |
|---|---|
| Trend | A series of higher highs (uptrend) or lower lows (downtrend) |
| Support | A level where buying has repeatedly stopped declines |
| Resistance | A level where selling has repeatedly capped rises |
| Moving average | The average price over a window, used to smooth noise |
These are descriptions of behaviour, not rules. Prices can break through any level when news changes expectations.
The same skills on prediction market charts
On a prediction market, the chart shows a probability between 0 and 1 dollar. A jump from 0.30 to 0.55 means traders now see the event as much more likely. Reading it well means:
- checking volume and open interest, because thin markets move on small orders;
- linking moves to news, as covered in news trading;
- remembering that prices converge to 0 or 1 as the deadline approaches.
Our guide on prediction markets vs the stock market explains the bigger differences.
Common chart mistakes
- Reading too much into a single candle.
- Ignoring the time frame.
- Seeing patterns that are really noise.
Investing and trading involve risk. Investor.gov, run by the SEC, offers free beginner material, and practising with paper trading is a safe first step.
Next step
In the United States, the regulated route is the Polymarket US app. Read our guides on signing up and depositing to get started, start small and only use money you can afford to lose.