What is the best practice for creating a new BIP39 Mnemonic?

[Husna QA]

If you use a standard Electrum, as far as I know, the Electrum does not generate a BIP39 seed phrase.

The standard version of Electrum Wallet does not support Satochip. Even after basic setup, the current 4.5.8 version does not recognize Satochip hardware.
I used Electrum 4.5.4.0.12, which contains the Satochip plugin. https://satochip.io/setup-use-satochip-with-electrum-bitcoin/

You are right; I tried to look at https://github.com/spesmilo/electrum/blob/master/RELEASE-NOTES, but I did not find Satochip on the Hardware Wallet list that Electrum has supported.

Some hardware wallets that Electrum has supported include:
Trezor One, Btchip (Ledger), Keepkey, Ledger Nano S, Digital Bitbox, Trezor T, Coldcard, Archos Safe-T Mini, Bitbox02, Ledger Nano S Plus, Jade, Trezor Safe 5, Ledger Flex.

Is the new generate seed process not found in your Electrum Satochip Client as in the following screenshot?

https://satochip.medium.com/electrum-bitcoin-client-set-up-a-hardware-wallet-in-10-easy-steps-99d932817d9e

[Forsyth Jones]

I still use the mnemonic generated by my Trezor model T to this day. You can ensure randomness by generating your mnemonic yourself using data, like flipping a coin, but for me, devices with good entropy sources and open source code are enough...

We can add more entropy by extending the wallet with a passphrase BIP39, which is the ideal level of security.

[bitmover]

I still use the mnemonic generated by my Trezor model T to this day. You can ensure randomness by generating your mnemonic yourself using data, like flipping a coin, but for me, devices with good entropy sources and open source code are enough...

The risk of generating entropy by yourself is where will you store that seed.

When you generate the seed in the coin and note down on paper, all is fine. But when you write that seed in your computer and generate the wallet, the risk begins.

Using a hardware wallet is much safer, because the seed never leaves the device, which is totally unhackable (at least until today nobody was able to hack it)

[Forsyth Jones]

The risk of generating entropy by yourself is where will you store that seed.

When you generate the seed in the coin and note down on paper, all is fine. But when you write that seed in your computer and generate the wallet, the risk begins.

Using a hardware wallet is much safer, because the seed never leaves the device, which is totally unhackable (at least until today nobody was able to hack it)

Yes, if someone owns a hardware wallet but stores it electronically and without an air-gapped environment, they have defeated the main purpose of using such a device.

The recovery phrase should always be written down offline and kept securely.