I've seen in people's tutorials that they use both RSI and MACD in their charts. Since both RSI and MACD are momentum indicators, what is the advantage of using them both?
From what I've read, and from what I observe on price changes, MACD is a lagging indicator and eventually will only serve as confirmation. Of course this depends on the time frames you use, but I find the RSI to be much more reliable. I'm still just paper trading, but normally I act on RSI being oversold, and after I "submit" my trades, I will eventually see the MACD confirm that my move was correct.
Of course that you can't really use just one indicator, so you should combine a few. You will act on some, and get confirmation on others, and be more confidant in your trades that way.