6.            Please change your password frequently and don't tell to anybody. Your password should be stored in a secured place.

7.            Do not reply any e-mail from people whom you don't know.

8.            Do not try to access to other computer, because it is illegal and unethical.

9.            Please get permission from your parent or guardian before you are going to do online shopping.

10.      Please update and patche your computer frequently, which can help you to
           protect you computer.