: If your email appears in a breach, immediately change that password and any other account where you reused it. Use a Password Manager (like Bitwarden or 1Password) to ensure every account has a unique, complex password.

: Use APIs (like the HIBP API) to block users from choosing passwords known to be in leaked "combolists."

: Even if a hacker has your password from a list like "20k_Email_Account_.txt," MFA (via an app like Google Authenticator or a security key) can prevent them from logging in.

: If you are worried your information is in such a list, use Have I Been Pwned . Enter your email to see which specific breaches you were involved in.