Day trading guide: After a highly volatile session on weekly F&O expiry, Indian stock market ended flat on Thursday. Nifty 50 index ended 6 points lower at 17,382 whereas BSE Sensex lost 51 points and closed at 58,298 levels. Bank Nifty index went off 233 points and closed at 37,755 levels. Volumes on the NSE were in line with recent average. Among sectors, metals, IT and healthcare indices rose the most, while telecom and realty indices fell the most. Broad market indices performed a little better than the Nifty though advance decline ratio was much below 1:1.