There are different password policies which
could define a secure password. The rules we recommend for creating a
secure password is as follows:
1) 6 - 8 alpha-numeric (Numbers, letters, symbols) characters in length
2) Varying case (Upper and lower case)
3) No dictionary words in the password forwards or backwards.
4) Change passwords every month or so
5) Never reuse passwords
Remembering passwords can be difficult, so one good rule of thumb is to use the phrase based password mechanism. For example, if your favorite quote is "Any sufficiently advanced technology is indistinguishable from magic" (Arthur C. Clarke), then your password could be "AsAtIiFm001". Thus, as long as you remember your quote, and the fact that each character alternates between upper and lower case letters, it begins with an uppercase letter, and your number for the password is 001, your password would be very hard to dictionary attack, or brute force. You should determine how secure you want your account, and apply more complex requirements as your need for security increases.
We recommend you to check follow website http://strongpasswordgenerator.com/ and generate strong password for you.