The green and red bars that trace across the top of the price graph describe the ability of that stock to move in a persistent vertical direction (up or down) over time. A green bar suggests an uptrend (vertical movement up) and a red bar suggests a downtrend (vertical movement down). You want to go long in stocks in which green predominates and avoid or short stocks in which red predominates. If neither color dominates (but rather, a candy cane effect with rapid switching from red to green), that suggests the inability of that stock to make sustained progress in either direction. Unless you are a short-term or day trader, you want to avoid stocks that exhibit this non-trending characteristic.

Some stocks trend. Others do not. It is far easier to make money in stocks that trend vs. stocks that do not trend. If a stock trends, the bars will appear above prolonged periods of persistent price action in one direction.