Using a BIP39 generator is straightforward: you select the number of words you want in your mnemonic phrase, and the generator produces it along with a corresponding seed. This seed is used to generate the private keys and addresses in your wallet. Security is a top priority when choosing a BIP39 generator. It's important to use a trusted generator to ensure that your mnemonic phrase is generated in a truly random and secure manner. Hardware wallets often include built-in BIP39 generators, offering a secure way to manage your cryptocurrency. 

With this script you can extract and convert mnemonic phrases in a couple of clicks.