WARNING: Incorrect usage of the passphrase feature can result in loss of funds. Use this feature at your own risk. Get very well informed before you try it.
By using the passphrase feature of a hardware wallet like Ledger or Trezor, you can exponentially increase the security of your funds. This video reviews how passphrases work and why all cryptocurrency users - especially DeFi users - should strongly consider using one.
Trezor blog post on passphrases (with chart shown in video)
Trezor passphrase info from security wiki
Ledger advanced passphrase security article
-- Amazon Purchase Links --
(make sure seller is "Ledger" or "Trezor" only)
Ledger Nano S https://amzn.to/2TiN0qY
Ledger Nano X https://amzn.to/2T4YyPA
Trezor Model T https://amzn.to/3858tsD
Trezor One https://amzn.to/3c9RHvM