Why is Fridays recovery important? What is Index Management, why is it important for the market?

Why is Friday's recovery important? What is Index Management, why is it important for the market? How is Index Churning happening? When will Bank Nifty gain strength? Should banks focus on Nifty instead of Nifty? Traders, Positional Traders Where to Book Profit? Know from Anil Singhvi...