A password which can be guessed easily means a word in the dictionary, a personal name, a place name, a string that has the repeated characters or is easy to understand and so on.

(1) Common English words in the dictionary
　password、baseball、soccer、monkey、dragon

(2) Names of yourself and your families, date of birth, place names, names of pets
　yamada、tanaka、taro、hanako (names)
　19960628、h020315 (date of birth)
　tokyo、kasumigaseki (address)
　ruby、koro (names of pets)

(3) String that has the repeated characters or is easy to understand
　aaaa、0000 (combination of same characters)
　abcd、123456、200、abc123 (array of simple numbers and letters )
　asdf、qwerty (array of keyboards)

In addition, avoid using a password such as phone number, postal code, car number, employee code, the information that others can guess easily and the same as the user ID and so on.