After an indecision doji candle on April 6, there was a bullish engulfing candle. Technically speaking, this is a strong pattern that only signals a buy if the high of the candle is surpassed the following day (sometimes it takes two days). Today's high of 43.72 went over yesterday's high of 43.66.
If you are learning, the same is true for bearish engulfing candles. you can buy puts earlier based on other indicators, but the signal comes when the low of a bearish engulfing candle is broken.