After reaching an important support level, Guardant Health (GH) could be a good stock pick from a technical perspective. GH surpassed resistance at the 20-day moving average, suggesting a short-term bullish trend.The 20-day simple moving average is a popular trading tool. It provides a look back at a stock's price over a 20-day period, and is beneficial to short-term traders since it smooths out price fluctuations and provides more trend reversal signals than longer-term moving averages.Like other SMAs, if ...