Short answer: it’s a plain line of text containing your secret key, unencrypted. Anyone who photographs it can generate your codes forever, silently, and only re-enrolling revokes it. Here’s what’s actually encoded in those squares.

Short answer: My Profile → Authentication → Two-Factor Authentication, with a hardware security key if you have one. Then audit your API tokens — they bypass your login entirely, and that’s the half most people forget.

Short answer: do their email and nothing else, use whichever method they’ll actually keep — even SMS — and put the recovery codes on paper with a copy at your house. Then teach one sentence: nobody ever needs the code from your phone.

Short answer: no, Netflix doesn’t offer 2FA and never has. What you get instead is sign-out-everywhere, access history and profile PINs — which makes a unique password and a well-secured email account your real protection.

Short answer: on an exchange, 2FA is your main defence. In a self-custody wallet, it barely applies — whoever holds the seed phrase owns the crypto. Two different models, and most losses come from applying the wrong one.

Short answer: Settings → Security → Two-factor authentication, enabled separately for sign-in and for withdrawals. Then turn on Global Settings Lock and whitelist withdrawal addresses — on an exchange, those matter as much as the login.

Short answer: it’s in the same settings page you used to enable it — but ask what problem you’re solving first. Constant prompts, rejected codes and a new phone all have better fixes than switching your protection off.

Short answer: accounts.nintendo.com → Sign-in and security settings → 2-Step Verification. Nintendo supports authenticator apps only, no SMS — and you can’t set it up on the Switch itself, which catches people out.

Short answer: update or remove your old number on every account before you give it up — especially recovery numbers, which break accounts even when your day-to-day 2FA is an app. Disconnected numbers get reissued to strangers.

Short answer: Settings → Users and Accounts → Account → Security → 2-Step Verification, or do it in a browser to avoid typing on a controller. Pick the authenticator app over text messages, and write the backup codes on paper.