1.MACD-Moving Average Convergence Divergence is an oscillating indicator. It is a trend following and momentum indicator. If the MACD lines are above zero for a sustained period of time, the instrument is likely trending upwards and if the lines are below zero for a sustained period of time also, the trend is likely down, Potential buy signal occurs when the MACD moves above zero and a potential sell signal when it crosses below zero.
2.The difference between MACD and RSI (Relative Strenght Index) is while MACD moves above /below zero and establishes trend direction, RSI moves between zero to 100 and establishes trend strength-overbought / oversold states.
3.OBV-On-Balance Volume is a trend continuation indicator. The indicator measures cumulative buying and selling pressure by adding the volume on up days and subtracting volume on down days. The volume should confirm trends. A rising price should be accompanied by a rising OBV and a falling price should be accompanied by a falling OBV. However, if OBV is rising and the price is not, it is likely that the price will follow the OBV in the future and start rising. If the price is rising and OBV is flat-lining or falling, the price may be near a top. If the price is falling and OBV is flat-lining or rising, the price may be near a bottom.