Technical analysis

How to Find Support and Resistance Levels on the Chart

Astron Team · 09/24/2026 · 6 min read

Before learning any more elaborate indicator or chart pattern, practically every trader goes through the concept of support and resistance. It's one of the simplest ideas in technical analysis and, at the same time, one of the hardest to apply consistently, since two people looking at the same chart often draw lines in different places.

This article proposes a more objective method for identifying these zones, reducing the subjectivity that tends to trip up beginners.

What support and resistance are

Support is a price region where buying pressure has historically outweighed selling pressure, halting or reversing declines. Resistance is the opposite: a region where selling pressure has historically outweighed buying pressure, halting or reversing rallies. These levels aren't exact, infinitely precise lines, but rather zones, since market behavior rarely respects a single exact price repeatedly.

A practical method for identifying relevant zones

1. Look at a longer period of the chart first, identifying the most obvious highs and lows by eye, without forcing lines onto unclear points.
2. Mark it as a zone, not a single line — a price range instead of an exact value, since the market usually reacts near the level, not exactly at it.
3. Prioritize levels tested more than once: the more times the price has reacted in that region, the more relevant it tends to be.
4. Also watch for so-called psychological levels, like round numbers, which tend to concentrate buy and sell orders because they're easier reference points to remember.
5. Reassess periodically: a resistance broken with force often becomes a support, and vice versa — this is one of the most useful behaviors to watch for.

A numerical example of identification

Suppose an asset has reacted three times in the R$ 118.00 to R$ 120.00 range over two months, falling each time it approached that region. This repetition turns the R$ 118.00 to R$ 120.00 range into a relevant resistance. If, in a later move, the price breaks strongly above R$ 120.00 and, after a few days, comes back to test that same range from above, without breaking back below it, that reinforces the reading that the old resistance has become a new support — a classic behavior called polarity flip.

How to confirm a level's strength before trading

• Number of previous touches: levels tested repeatedly tend to be respected more than levels touched only once.
• Volume in the region: reactions accompanied by higher volume tend to reflect a more significant zone.
• Time since the last test: very old levels can lose relevance, especially if the market context has changed a lot since then.
• Confluence with other tools: a support zone that coincides with a relevant moving average or a Fibonacci level tends to gain extra weight.

Common mistakes when drawing support and resistance

The most frequent mistake is drawing too many lines, marking every small wiggle as a relevant level, which ends up creating a cluttered chart that's not very useful in practice. Another mistake is treating a level's breakout as automatic and final as soon as the price touches the line, without waiting for confirmation — many breakouts fail and the price returns inside the previous range before any consistent move.

Practical conclusion

Support and resistance remain among the most useful tools in technical analysis precisely because of their simplicity, but they take practice to identify consistently and less subjectively. Like any tool, they indicate probabilities, not certainties, and trading without defining a stop in case the level doesn't hold remains an unnecessary risk, regardless of how many times that zone has reacted in the past.

Support and resistance across different time frames

Just like chart patterns, support and resistance levels change in relevance depending on the time frame analyzed. A zone identified on a weekly chart, formed over months, tends to be respected by a larger number of participants than a zone formed in a few minutes on a very short-term chart. That doesn't mean short-term levels are useless — they're useful for refining the exact entry point — but the context of a larger period helps you understand that region's real weight.

A practical approach is to start by identifying the most relevant zones on a longer-period chart, marking them as reference points, and then use a shorter period to watch the price's behavior when it finally gets close to those zones. This combination avoids the mistake of treating every small short-term reaction as if it carried the same weight as a support or resistance zone tested repeatedly over months.