Banknifty- Volatile day, profit booking happened today. 39500 is weekly support. If hold here the next it can break 39500. Flat Opening - 40200 = Hourly resistance, if it breaks then it can continue upmove but will face multiple resistance. Momentum could be slow.
Gap up - 40500=Resistance, it can go up to there and then if any -ve price action formed, will sell it. If not big gap up will buy on pullback only.
Gap down - Downtrend cont. but due to cont. move it may be slow, 39500=target if goes down will sell it. Buy if price action forms.