How to create strong, secure passwords by learning how to crack them  

We'll show you how passwords are cracked and even how to do it yourself, so you can see exactly why a strong password matters.

As our brief foray with a cracking tool will show you, your only protection against a determined password-cracker is—you guessed it—a long, complex string of 10 or more characters. Anything shorter, let alone simpler, is too easy to crack. Know that, and suddenly using a password manager looks a lot easier than trying to create passwords all by yourself.

Read on to learn more about how passwords are hidden from crackers, and how crackers try to tease them out.

How to create strong, secure passwords | PCWorld

your only protection against a determined password-cracker is—you guessed it—a long, complex string of 10 or more characters.

10 character password is still not strong enough, even if consisting of mixed characters.
It may be strong enough for casual crackers, but some theoretical "cracking agency" could easily find it weak, their GPU farms would crack it in maybe less than one year.

Password manager is must have tool to have unique, complex and long passwords.