Call it what you will, its all price action. a candle is simple a graphical representation of that price action and each candle ha a story of its own to tell, and a few candles together make up a pattern.
A guy named Thomas Bulkowski wrote the Encyclopedia and included percentages of this candle or that pattern. For me to be trusted it must have over a 75% percentage of success. To that end, there are only a few basic patterns and candles.
However, Steve Nison gets most of the credit for this education.
At the beginning of the session, PA can only go three ways, up, down and sideways.