Options trading queries

It is reported by many analysts that on Friday ( 16 th April 2021) NIFTY 14700 APRIL EXPIRY CALL OPTION have seen unwinding.

Can anyone pls tell me how to interpret and how to identify call unwinding from the options data.
And also short covering from options data.
And how to know about put call ratio status

https://zerodha.com/varsity/chapter/open-interest/#:~:text=Open%20Interest%20(OI)%20is%20a,1%20contract%20to%20the%20buyer.