Charts have great value to traders who
understand them, because they constantly reflect the relation of Supply (resistance) and Demand (support). They reflect the development
of forces that are likely to act as soon as they are strong enough to overcome
the resistance that opposes them. They
present in graphic form accumulated evidence as to whether or not this
resistance will be overcome.
A support
level is a price level where the price tends to find support as it is going
down. This means the price is more likely to "bounce" off this level
rather than break through it. However, once the price has passed BELOW this
level, by an amount exceeding some noise, it is likely to continue dropping
until it finds another support level and the
old support becomes resistance level.
A resistance
level is the opposite of a support level. It is where the price tends to
find resistance as it is going up. This means the price is more likely to
"bounce" off this level rather than break through it. However, once
the price has passed ABOVE this level, by an amount exceeding some noise, it is
likely that it will continue rising until it finds another resistance level and
the old resistance becomes support level.
Proactive support and resistance methods are 'predictive' in that they
often outline areas where price has not actually been. They are based upon
current price action that through analysis has been shown to be predictive of
future price action. Proactive support and resistance methods include Measured
Moves, Swing Ratio Projection/Confluence
(Static (Square of Nine), Dynamic
(Fibonacci)), Calculated Pivots, Volatility Based (Bollinger Bands), Trend lines/Channels
and Moving averages, VWAP, Market
Profile (VAH, VAL and POC).
Reactive support and resistance are the opposite: they are formed
directly as a result of price action or volume behavior. They include Volume
Profile, Price Swing lows/highs,
Initial Balance, Open Gaps, certain Candle Patterns (e.g. Engulfing,
Tweezers) and OHLC.
A price
histogram is useful in showing at what price a market has spent more relative
time. Psychological levels
near round numbers often serve as support and resistance. More recently,
volatility (Bollinger Bands) has been used to calculate potential support and
resistance.
Most commonly
used are Price Swing low and highs, Trend Lines,
Channels, Moving Averages, Fibonacci Retracements, Swing rules, Psychological Level,
Bollinger Bands, Candle Patterns (gaps, tweezers, engulfing).
When prices are above a gap they act as
strong support, and when prices are below a gap they act as strong resistance.
Also, moving averages act as "key supports" and "key resistance"
zones. So when the price retreats to a MA it will bounce back up off it, so you
would add just above a MA. If no strong support is available on a pull back it
would be best to pass on adding more.