Wedges look like triangles with the apex of the triangle pointing counter current to the main trend, i.e. in bull markets the wedge is made by connecting a series of lower highs and a series of lower lows of daily prices and vice versa in a bear market. Wedges can give the appearance of rallies against the trend and can appear as trend reversals, but they are not, they are periods of correction and consolidation during the relentless progress of the main trend, so beware. They are invariably associated with overall and progressive reduction of volume. On completion the volume expands rapidly, often explosively, and prices may progress rapidly, sometimes creating gaps on the breakout.
It is essential that you study the volume accompanying these patterns of correction and consolidation. They should show distinctly lower volume on their development, almost drying up as they approach their termination. If volume is unchanged or increases as these patterns develop beware, you may well be observing a period of major distribution prior to a reversal of the trend.