I'm using RSI for divergence and Fibonacci re-tracement to easily spot future support and resistance. These two are my favorites, so easy to use and understand. But you also have to know first of course how to read TA, and the basics to be able to understand what's those two for. I've been using EMA as well when I was just a newbie in trading, but it's too confusing for to use more than 2 indicators so I stick to two only.