Technical analysis

How to Read a Price Chart From Scratch

Astron Team · 09/24/2026 · 6 min read

For someone who has never traded, a price chart looks like a meaningless jumble of colored lines and bars. But behind every move there's a simple story: buyers and sellers fighting over a price, minute by minute.

Learning to read that story doesn't require any complicated formula at the start. It requires understanding four basic ideas: trend, support and resistance, chart timeframe, and volume. Master those four pieces, and any chart stops looking random.

What a chart actually represents

A price chart shows how an asset's value has changed over time. The vertical axis is price; the horizontal axis is time. Each point on the chart records how much buyers were willing to pay, and sellers willing to accept, at a given instant.

The most widely used format today is the candlestick chart, which shows four pieces of information for each period: the opening price, the closing price, the high, and the low. When the close is above the open, the candle usually appears green, indicating buyers dominated that period. When the close is below the open, the candle appears red, indicating sellers dominated.

Identifying the trend

Prices rarely move in a straight line. They move in waves, and recognizing the direction of those waves is the first step in reading any chart:

• Uptrend: the price forms progressively higher highs and higher lows.
• Downtrend: the price forms progressively lower highs and lower lows.
• Sideways movement: the price oscillates between a ceiling and a floor, with no clear direction.

Knowing which of these three scenarios an asset is in avoids decisions against the tide: buying at the top of a downtrend or selling at the bottom of an uptrend tends to be a recurring source of losses for beginners.

Support and resistance: the invisible floors and ceilings

If you learn only one technical analysis concept, make it this one. Support and resistance are price levels where the fight between buyers and sellers tends to intensify:

• Support: a region where buyers tend to step in with force, slowing declines.
• Resistance: a region where sellers tend to step in with force, slowing rallies.

Think of a ball bouncing inside a room: the floor is support, the ceiling is resistance. When the price finally breaks through one of these levels, that move is usually called a breakout, and it often signals a meaningful shift in the balance between buyers and sellers.

Why the chart timeframe changes everything

One of the things that confuses beginners the most is choosing the chart timeframe, meaning the period each candle represents: one minute, one hour, one day. The same asset can appear to be falling sharply on a 5-minute chart while, at the same time, being in a clear uptrend on a daily chart.

Because of that, beginners tend to benefit from watching larger timeframes, like the 1-hour or daily chart: they filter out some of the short-term noise and tend to show more reliable signals than very short timeframes, which react to every tiny wiggle.

Volume: the fuel behind the move

If price is the car, volume is the fuel. It shows how many trades are backing a move and usually appears as a histogram at the bottom of the chart.

• A resistance breakout with high volume has a better chance of continuing, because it shows strong buyer participation.
• A breakout with low volume is more suspect: it can be a false move that reverses shortly after.
• When the price rises but volume keeps shrinking with each new high, that can indicate the move is losing strength.

Putting the pieces together in practice

Imagine an asset trading at R$ 50.00 that has repeatedly found buyers near R$ 47.00 (support) and sellers near R$ 53.00 (resistance), forming a sideways range. If the price breaks above R$ 53.00 with volume clearly above the average of recent periods, that's a stronger signal of continuation than if the same breakout happened on weak volume.

No chart reading guarantees the outcome of a trade: it only organizes probabilities. Tools like the ones available on Astron help visualize trend, support, resistance, and volume in the same place, but the final interpretation and risk management remain the trader's responsibility. Start by watching a few assets on larger timeframes, and only later move on to faster, more complex readings.