Well, you have to be smart enough to know what personal information to post and which one to not post. Also make sure that passwords are super strong. That is the main reason accounts get hacked, and not because of personal info. Your personal information is available on public domain. Do a check yourself.
Use something like PasswordSafe to store your passwords for different sites. But make sure that the Master password to PasswordSafe is at least 15 to 20 characters long with upper, lower case, special characters and numbers. PasswordSafe can also generate passwords for you that you don’t have to remember. Just double click when in the app and paste it in the site. When you exit out of the PasswordSafe, that password is not in memory anymore.