Re: XKCD has been totuting the complexity angle for years
Why do people persist in promulgating this myth after all this time?
Do not do it; the xkcd approach of using real words in a string was cracked years ago - it falls to dictionary attack in no time at all.
Take the first letter of each word in a strong passphrase of at least fifteen words, with punctuation and capital letters, replace letters according to the 'l337' schema.
If you can't bring yourself to do that then use a password manager but, for goodness sake, do not use any real words - not even if you string them together without any spaces.
THE XKCD 'HORSEBATTERYSTAPLEYOURMOM' APPROACH IS INSECURE! DON'T DO IT!