Bip39-Standalone. Entropy values must be sourced from a robust source of randomness. This suggests flipping a good coin, rolling a good dice, sound measurements etcetera. Do NOT use phrases from books, lyrics from tracks, your birthday or steet tackle, keyboard mashing, or just about anything you're thinking that is random, https://sectordirectory.com/listings617627/bip39-words-https-linktr-ee-bip39-facts-about-bip39-checksum-revealed