Interest rate futures

Hi,

Refer to 62 Phobos Co.(BPP revision kit)
I am very confused on how to choose which month futures to use(March, June, September),I found out one statement that say buy ‘ March’ future because it mature just after payment date.Full repayment is on 1 September,then why choose March put option. Or any other way to easily determine which month futures to be used?

The another question is the basis point, basis risk is the difference between spot rate and future price. 94- 93.88 = 0.12
Then the model answer stated that between the closure and maturity of the contract(one month) then movement will be 4 ticks.(12/3)
That means three month movement will be 0.12, the three month interval is from ( 1 Mar to 1 Jun)?I want to forecast the 31 Mar price to make payment?

Actually how futures work? Borrower always sell futures.When is the date should sell futures, is the time the company borrow or make fully repayment?The spot rate today got influence what ?

Very sorry to ask such simple questions, I just not understand how futures work so i thoroughly cannot do the question with common sense thinking.Please someone help to answer. Thanks a lot.