Preferable advise for newbies who are yet to make any transactional mistakes, users who has been into Bitcoin for a while always propel safety when sending or receiving Bitcoin. Many have several Bitcoin address and should decide which they want to receive from. For those with loan service in Bitcoin, at the date of lending always tell which address they want the funds returned into, just like recently when Shas.. changed his address, address was forwarded to everyone through PM, if you send Bitcoin without consulting the receiver you will have to repay the cost of lost coin.