Rules to create a perfect password:
1) think of a word easy to remember, like a character in a cartoon, for example goldrake
2) transforming some letters into numbers, example: g0ldr4k3
3) add to the beginning or end of a number, such as your birth year, then g0ldr4k390
4) add a special character at the head or tail: g0ldr4k390_
5) Add the a capital letter for the site in which you are logging in, for example:
to facebook: g0ldr4k390_F
for twitter: g0ldr4k390_T
for amazon: g0ldr4k390_A
etc ..