If you are having a hard time remembering all the different logins and passwords for all the sites that you visit online, keep an address book on your desk!
Keeping an address book with the urls of your favorite sites, the login name and the password you are never going to forget.
This is much more secure than having an address book on your desk top that a hacker could get into and access all of your accounts.
Remember to always make sure your passwords are different even if you are using the same log in names!