volume and candle pattern

i am a beginner in intraday. and i have seen many a times a doji or any other small candle have large volume than that of a big bullish or bearish candle . and i am confused about that.

and can we use open interest data of a stock to find out the trend of the stock.

small candle large volume that’s a good sign i means despite such large volume price didn’t budge much if you can combine this with the overall trend plus some patterns n very few indicators that’s a jackpot

trend line works well with me for identifying the overall trend of something