Quick takeaway: Use this guide as general information. Product features, prices, eligibility and terms can change, so verify the current details with the relevant provider before acting.
Two-factor authentication adds another verification step to an account. Review the options offered by each service and keep recovery methods secure.
Common methods
Services may offer authenticator apps, security keys, passkeys, SMS or backup codes. Availability depends on the provider and account type.
Protect recovery methods
Store recovery codes somewhere secure and review trusted devices periodically. A second factor should not become a single point of failure because its recovery information is lost.
Review account alerts
Turn on security notifications where available so you can investigate unfamiliar sign-ins or changes promptly.