The longer the candle the bigger the price swing from low to high. A white candle (sometimes also called a hallow candle) signifies the stock closed higher than it opened. A filled or red candle signifies the stock closed lower than it opened. My initial reference was to the 2 candlestick pattern being what is called Bullish Engulfing also outside reversal or Bearish Engulfing, many times signaling a reversal ( bottom has been reached, stock now trying to turn upwards.) Not 100 % prediction however very high probability. Check out the link will provide pics and more complete verbiage.
Link ; https://www.investopedia.com/terms/o/outsidereversal.asp
Note about Japanese Candlesticks "originated in Japan over 100 years before the West developed the bar and point-and-figure charts. In the 1700s, a Japanese man named Homma discovered that, while there was a link between price and the supply and demand of rice, the markets were strongly influenced by the emotions of traders."
Link ; https://www.investopedia.com/trading/candlestick-charting-what-is-it