Why technical analysis?
Fundamental analysis, the study of the performance of a company using such things as P/E ratios, periodic comparable sales results ( for growth ) and other such items is a great long term tool for those with the time and resources. We, the little guys, have an advantage in the charts. The charts show us what the big guys in the market are doing. Volume and price changes frequently occur in well-known patterns.
Why does this help us? Simply because we can move more quickly and without disturbing the market action the big guys have put into place. They usually have to move carefully over time in order not to have too great an effect on prices. We don't.
Technical analysts believe that all the fundamental knowledge is contained in the action of the major traders that set the markets. We just have to "read" that action and act accordingly. Thank you charts.