Google have written a post about password security, and I recommend you read what they have to say.
In a nutshell: You should use a unique password, with numbers, letters and punctuation, which is not based on personal data (cannot easily be guessed). Make a note of your password to help you remember, but never leave it by your computer or any other obvious place.
You should not use the same password as another account you own, as this is essentially putting all your eggs in one basket. If one of the websites you log into gets hacked, and you use the same password everywhere, then none of your online account are safe.
It is always better to do a long and complex password which you may forget (and then using the “Forgot password” link to set a new one) than to have an easy-to-remember password which somebody else could guess.
If you have any other concerns about securing your website, please do not hesitate to contact Rubious.