Bip39 Standard. Entropy values should be sourced from a strong source of randomness. This implies flipping a fair coin, rolling a good dice, sound measurements and so on. Don't use phrases from books, lyrics from music, your birthday or steet handle, keyboard mashing, or everything you're thinking that is random, https://limawebdirectory.com/listings562020/bip39-word-list-numbers-https-linktr-ee-bip39-bip39-words-an-overview