People borrow things and do not return them. What to do?

What is the ruling on paying a fee to a brokerage in order to obtain a loan or purchase real estate through the bank?

How the delayed portion of the mahr may be paid when the value of the currency has dropped

Ruling on negative interest that the bank takes from the one who deposits money with them

Ruling on a loan in which it is stipulated that one take out life insurance, if the condition is not implemented

He borrowed some money, then the lender died, and he does not know any of his relatives

Rulings on rewards for having a current account, if the reward comes after the customer withdrew all the money from that account

She lent some money and took some gold as collateral, and the gold went missing

The value of the currency has changed, how can the loan be repaid?

He took a student loan and did not know that it is haram