For Internet Savy's maintaining passwords is the primary task and most important task. If u fail u keep your password safe its the end.
So follow some rules :
1) Don't use too simple passwords that can be guessable by anyone. Like 123, abc, apple so on.
2) Don't Keep your name or your favorite names because persons who know you can easily guess these.
3) Don't Keep too much tough passwords to remember. Because if you fail to remember it then probably you loose your account. (There may be recovery options but its not a good practice.)
4) Don't use Email id passwords for other accounts like forums, websites like facebook, twitter.
5) change your passwords periodically.
6) Finally don't write your passwords on books or paper which are easily seen by others.