Bip39. Thanks to the cryptographic structure of BIP-39, a weak passphrase won't lessen the protection of one other wallets or enable reveal the seed words. Mnemonics are representation of entropy. First step entails producing a call concerning how much entropy you think about Safe and sound for your personal functions. https://socialicus.com/story4186851/bip39-wallets-https-linktr-ee-bip39-top-guidelines-of-bip39-words