It is good to keep a hand-written list of your online passwords so that you will not forget them.  Put this list somewhere safe in your home where no one else will have access to it but you.  Never store a list of passwords on your computer or anywhere online because if an identity thief gained access to the files stored on your computer, they would then have access to every single account that is listed in the file containing your passwords. Cookies are small bits of information that sites store on your computer to track the places you have been on the Web.