@raynbow- Shopping online is also safer if you designate only one credit card account or bank account for all of your online purchases. When you do this, you do not have to worry about keeping track of multiple accounts.
In addition, should any problems occur, you will only have to worry about one account. This will also make returning items a lot easier, because you will know exactly which account you used to make the original purchase. It will be easy to follow up on refund amounts, too.