Why is it important to use caution before putting any personal information on a computer? (example(s) required)

I think everyone knows the general idea to the answer to this question but this is my final exam question...so it has to be thorough. Any specific ideas for an answer please?

1 answer

consider that whatever you put on the computer, others can see and use
thru hacking
thru use of your computer
when you dispose of your hard drive.

And, some of the info you put on your computer can be used to gain access to other information about you, including bank and other accounts.