This document provides an overview of various technical analysis chart patterns and theories, including: 1) The head and shoulders pattern which can be bullish or bearish, with variations that impact the probability of a successful formation. 2) Other patterns like M, W, triangles, and flags/pennants which are continuation patterns formed by sharp price movements followed by sideways consolidation. 3) Dow theory which defines trends as successively higher/lower peaks and troughs, with reversals occurring when highs/lows are broken. 4) Elliot wave theory which contends social trends can be seen in financial markets through recurring patterns of impulsive and corrective waves.