Good passwords use random letters and numbers. For instance, F0phR0ck is a
word that makes excellent use of zeros and alphabet
cases. It's not in any dictionary and it's not very hard to remember. You
can also make up acronyms, such as I eat 5 chocolate bars a day - Ie5cbad. 
 
The formula for inventing a good password is to not use a formula; use your
creative, haphazard imagination instead. Don't feel restricted
by numbers and letters. You can use any combination of other characters such
as punctuation marks, symbols, and even blank spaces.
Remember that your password is your key to your account. It doesn't have to
be logical or even make sense. It just just has to get you in
and keep strangers out. 

- No names, favorite foods, addresses, dates, or anything that can be linked
  to yourself.
- Don't use all lowercase letters.
- Try to have at least two numbers or two non-alphabetic character such as
  "()[]{}.~!@#$%^&* and so on.
- Don't use words from any known dictionaries including but not limited to
  english, french, hebrew, greek, italian, russian, swahili, klingon, or
  any other known modern or ancient spoken or written language.

The command to change your characters password is 'passwd' as in unix.

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