There are two methods to create strong passwords. First, you can employ a random password generator, such as http://strongpasswordgenerator.com/
However, the most effective way to create a complex password that is easy to remember, is through the use of acronyms.
For example, create a phrase which is easy to remember:
- I like to eat Oreo cookies at night.
- Take the first letter from each word:
- Substitute a number or symbol for one or more of the letters:
- 1lteOc@n (substitute 1 for the I, @ for the a)
This process results in a password that will not be found in a dictionary, is not easily associated with the user (such as their address or phone # would be), and contains upper and lower case letters, numbers and symbols. This is a very complex password that is impossible to guess and would take a password cracker a long time to break.
To have a password generated for you, there are several websites which offer this free of charge.
Here is one site: http://www.copysense.co.uk/passgen.php