The indicators does not forecast the market. They uses chart data already displayed as bars, candles etc, but with different visualization. Trend indicators will mislead you during choppy, and oscillators during the trending market. Studding indicators is easy, but most important is to understand which market you are dealing and then to choose which indicators to apply :)
I used most of the Ichimoku Kinko Hyo indicator. This indicator helps to find quality trading opportunities in the trading market, establish price momentum, and plot decisive support and resistance bands.
Personally I do not use any indicators. I trade based on price action. I follow candles, candlestick and price behavior in terms of support and resistance. You have to find out which indicators work for you or you understand the most.