1. How to take Stock data ?

https://www1.nseindia.com/products/content/equities/equities/eq_security.htm

2. How to take Index data ?

https://www1.nseindia.com/products/content/equities/indices/historical_index_data.htm

Announcements ? Annual Reports ? Board Meetings? Corporate Actions ? Financial Results ? Insider Trading ? Promoter Pledge ? Shareholding Patterns ?

https://www.nseindia.com/get-quotes/equity?symbol=RELIANCE

Indices ?

https://www.niftyindices.com/indices/equity/broad-based-indices/NIFTY-50