This is harder than it sounds. It really is.
But its not impossible.
First, come up with a story about you, that only you will know. This story should be anywhere between 4 to 30 words or so. You can make them longer or shorter, but there are risks in either direction.
Take the first letter of each word of *your* story. If you want to be advanced, you can include punctuation marks!
For example if your story is:
“Adventurous denizens crow about their success! Always and always!”
The password will be “Adcats!Aaa!”
You can vary the formula (e.g. alternating first and last letters, etc.. The key thing is to link the password to a story that only you will know.