What does the Margin Calculator primarily help with?

What are the two main components that make up the Initial Margin (IM) for futures trading?

Which of the following exchanges is NOT mentioned as an option within the Zerodha Margin Calculator?

What is the term used to describe the futures contract that expires in the current month?

What is the name given to the trading strategy that involves simultaneously buying and selling futures contracts of the same underlying asset but with different expiry dates?