Bip39 Standard. Thanks to the cryptographic structure of BIP-39, a weak passphrase won't reduce the safety of the opposite wallets or support reveal the seed words. Any time you increase a passphrase for your seed phrase, it fully improvements the derived private keys and public addresses for your personal wallet. https://bookmarknap.com/story9951504/bip39-passphrase-https-linktr-ee-bip39-5-simple-statements-about-bip39-mnemonic-explained