Bip39. Entropy values should be sourced from a strong supply of randomness. This suggests flipping a good coin, rolling a good dice, noise measurements etc. Don't use phrases from books, lyrics from music, your birthday or steet handle, keyboard mashing, or nearly anything you're thinking that is random, mainly because https://directorylinks2u.com/listings13049548/bip39-mnemonic-https-linktr-ee-bip39-the-5-second-trick-for-bip39-seed-generator