can someone please explain volume?!!

Many good traders talk about how good of an indicator volume is. Despite looking and looking for an explanation I can't find anything that says how to incorporate it into a trading strategy and how to use it to determine if the trend is bullish or bearish. From all I can see if there is a big green candle then there is a big green volume bar, and if there is a big red candle then there is a big red volume bar. I can see many Instances where the trend goes way up but there are many small green volume bars and some big red ones mixed in. From what I can see the volume is only proportional to the size of the candlestick and nothing more. Id really like to understand this better, could someone please explain? thank you.
Chart PatternsTechnical IndicatorsTrend Analysis

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