Bip39 Standard. Now, at the next stage we use these getting and change important bunch to create personal non-public keys. Use the above generate personal keys and chain code and move them to the above mentioned talked about functionality kchild = kpar + hash(Kpar, cpar, i) to create unique keys. https://bookmarkhard.com/story18750107/bip39-wallets-https-linktr-ee-bip39-the-best-side-of-bip39-mnemonic