Passwords are rather important nowadays. Yes, back in the past they were not that important, and Richard Stallman advised to use the empty passwords once the access control system has been implemented, and showed the password database can be cracked easily. He has sent all the users the message like "Hi, I see you are using the password %user_password%, why not using the empty string?", so just pressing the key on the logon to proceed.
This was a good idea not to identify yourself with the coded string in pre-WWW world, but unfortunately we live in the world when you are just not allowed to do that, and basically it is not safe anymore. We will try to describe some basic tips to help you with the account protection. These rules are a bit obvious, but still not followed by millions of people.