All market fundamentals are reflected in price data. Moods, differing opinions, and other market fundamentals need not be studied.
History repeats itself in regular, fairly predictable patterns. These patterns, generated by price movements, are called signals. A technical analyst's goal is to uncover a current market's signals by examining past market signals.
Prices move in trends. Technical analysts believe price fluctuations are not random and unpredictable. Once an up, down or sideways trend has been established, it usually will continue for a period.