Fundamental and Technical analysis.

Future stock price can be predicted by either studying Fundamental or technical analysis or by combining both of them.
Fundamental analysis, is time consuming and all the data points are not available to retail traders. Only big players have all the information, before it it made public. Fundamental analysis will give you information of the good company, but it does not give you exact levels for trading.
Technical analysis, data is available to everyone easily. It involves the study of past price and volume data to predict the future trend. This is can be done by studying the charts. Though line and bar charts are available, the candlestick charts have become popular as they give clear visual indication. With help of chart patterns and candlestick patterns , you can trade the market, with exact entry. target and stop loss levels. Technical analysis is an art and not a rocket science and requires dedication and discipline from the trader to succeed.