I use diceware as the article recommends. I suggest using 10 random words. Each word has about 13 bits of entropy, so a 10-word passphrase will have about 130

I use diceware as the article recommends. I suggest using 10 random words. Each word has about 13 bits of entropy, so a 10-word passphrase will have about 130 bits. Write the passphrase down and keep it in a very secure place. After using the passphrase a few times, you'll remember it surprisingly easily.