Bip39 Standard. Entropy values should be sourced from a strong supply of randomness. This suggests flipping a fair coin, rolling a fair dice, sounds measurements etcetera. Never use phrases from guides, lyrics from tunes, your birthday or steet handle, keyboard mashing, or something you think is random, for the reason https://britedirectory.com/listings13033607/bip39-words-https-linktr-ee-bip39-not-known-details-about-bip39-passphrase-generator