If you had to keep just one concept from technical analysis, it would be support and resistance. These are price levels where the market has repeatedly shown difficulty in continuing to advance. A support is a zone below the current price where buying tends to slow down declines; a resistance is a zone above where selling tends to cap rallies. A large part of traders’ decisions revolves around them.
Why do they work? Deep down, they are collective psychology turned into a chart. When the price falls to a level where many buyers previously entered, those participants remember that zone and buy again, which supports the price. At a resistance the opposite happens: those who bought high and were left trapped take the chance to exit as soon as the price returns to that level, generating selling pressure. The market’s memory creates these invisible walls.
To identify them, look at the chart and search for zones where the price has turned around more than once. The more times a level has produced a bounce, the more relevant it is considered. Do not think in millimeter-precise lines but in zones: price rarely respects an exact value, but rather a narrow range. Mark those areas with horizontal lines and watch how the market interacts with them across different timeframes.
A fascinating phenomenon is the exchange of roles. When the price breaks through a resistance with force and clears it, that level often becomes a new support. And when a support gives way, that level starts acting as resistance. This behaviour, known as “polarity”, is one of the most reliable tools in technical analysis and appears again and again in every market and timeframe.
Support and resistance are not always horizontal. Trendlines are diagonal supports and resistances that accompany the price in an upward or downward move. There are also dynamic levels, such as moving averages, which act as a moving support or resistance as the price advances. Combining horizontal levels with trendlines and moving averages gives you a much more complete map of the terrain.
The practical usefulness is twofold. On the one hand, these levels offer you logical entry points: buying near a support or selling near a resistance improves the trade’s risk-reward ratio. On the other, they tell you where to place the stop loss —just on the other side of the level— and where to set profit targets, at the next relevant zone. The level gives you structure to plan the entire trade.
There are two ways to trade them. The bounce strategy assumes the level will hold and looks to enter in the direction of the bounce. The breakout strategy assumes the level will give way and looks to enter in the direction of the break, ideally confirmed by an increase in volume or a clear close beyond the level. Both are valid; what matters is having a plan and not improvising when the price reaches the zone.
Like everything in trading, support and resistance are tools of probability, not certainty. A level can break at any moment, especially on high-impact news. That is why they should never be used alone: combine them with candlestick reading, the overall trend, and strict risk management. Used well, they are the skeleton on which almost any technical strategy rests.
Sources: Bank for International Settlements (BIS), central banks, official MetaQuotes (MetaTrader 5) documentation and regulatory bodies.
