Support and Resistance — Trading Wiki

What Support and Resistance means

Support is a price floor where buying prevents decline; resistance is a ceiling where selling prevents advance. The bedrock concepts of all technical analysis.

In depth

Support and resistance are the most fundamental concepts in technical analysis, forming the foundation upon which virtually every other chart pattern, indicator, and trading strategy is built. Support is a price level or zone where historical buying interest has been strong enough to halt or reverse a decline, creating a 'floor' under price. Resistance is a price level or zone where selling interest has been sufficient to halt or reverse an advance, creating a 'ceiling' above price. The formation of support and resistance is rooted in market psychology and the collective memory of market participants.

When price bounces from a level multiple times, traders begin to anchor to that level — those who missed the previous bounce place buy orders there, and those who sold prematurely look for another chance to buy. This concentration of orders creates genuine supply and demand imbalances that reinforce the level. The principle of polarity states that when a support level is definitively broken, it tends to become resistance, and when a resistance level is broken, it tends to become support. This role reversal occurs because the psychological anchoring shifts: traders who bought at former support and are now underwater will look to sell at breakeven when price returns to that level, turning their former buying zone into a selling zone.

Support and resistance can be identified through several methods: horizontal levels based on historical price reactions, trendlines connecting swing highs or lows, moving averages (particularly the 20, 50, and 200-period), Fibonacci retracement levels, psychological round numbers ($10, $100, $1,000), and volume profile levels (the point of control where the most volume has traded). The strength of a support or resistance level depends on multiple factors: the number of times it has been tested (more tests = stronger level until it breaks), the volume traded at that level, how recently it was formed, and whether it aligns with other confluence factors.

Multi-timeframe analysis is crucial — a support level visible on the daily chart is far more significant than one only visible on the 5-minute chart.

Key points

• Support = price floor where buyers step in; Resistance = price ceiling
• Broken support becomes resistance and vice versa (polarity principle)
• Strongest levels have multiple touches and high-volume reactions

Practical tip

The more times a support or resistance level is tested, the more likely it is to eventually break. Counterintuitively, the 4th or 5th test of a level is more likely to result in a breakout than the 2nd or 3rd test, because each test absorbs available orders at that level.

Why it matters when you are learning

Support and resistance is the bedrock of all chart analysis. Master this before anything else — every other pattern builds on it.

Practising Support and Resistance on the simulator

Recognising Support and Resistance on a static example is easy; spotting it on the right-hand edge of a live chart, before the outcome is known, is the actual skill. Open the practice desk, scan a handful of instruments you already follow until you find a candidate, and mark the level that would prove the read wrong. Take a small simulated position, then come back a day later and compare what happened with what this page describes. Educational simulation only — not financial advice.