Hello Adam,
There are literally thousands of different indicators that swing traders can use. However, I have found the best strategy is a simple one that can be easily followed.
I personally follow the Morpheus swing trading strategy (https://morpheustrading.com/best-swing-trading-strategy) because it is based primarily on relative strength and volume, while using moving averages and prior lows/highs for support and resistance levels.
It works pretty well for me, but a trading strategy is only as effective if you can be disciplined to follow it closely, without fail.