Replacing letters with familiar symbols can make a password look complicated without making it hard to anticipate. A guesser can include common substitutions and suffixes in their candidate list. The published example P@ssw0rd123! is an illustration, never a password to use.

Length helps when it adds choices an attacker cannot readily predict. A long quotation and a phrase produced by independent random selections are different processes. The next lesson shows how to choose a passphrase without inventing a personal pattern.