#interest on the loan

Questions about the loan agreement

If a loan agreement is concluded between individuals without specifying interest, and the loan repayment period is not established by the agreement, do I as the lender have the right to demand immediate repayment of the loan, and is interest accrued for using the loan in such a case?

Loan to an acquaintance. How to properly issue it?

I want to lend money to a friend. How to competently arrange this legally, so that a person gives, so that there is evidence of this borrowing?

Mortgage?

Is the consent of the second spouse of the mortgage holder (husband of the person to whom the property is mortgaged) required when concluding a real estate mortgage agreement?

Can the interest exceed the body of the loan?

Loan questions

I am planning to take out a loan to develop my small business. Will I be able to use the support of the National Development Agency if my business is located in a frontline region?