Bip39-Standalone. Entropy values must be sourced from a strong source of randomness. This suggests flipping a good coin, rolling a fair dice, sounds measurements and so forth. Don't use phrases from publications, lyrics from tracks, your birthday or steet handle, keyboard mashing, or anything at all you think is random, https://directorytome.com/listings13027614/bip39-word-list-numbers-https-linktr-ee-bip39-bip39-mnemonic-generator-an-overview