Go to Settings → Security and Login → Two-Factor Authentication. Use an authenticator app (Google Authenticator, Authy) or hardware key (YubiKey).
For those who may not be familiar, "intitle index of password Facebook" refers to a type of search query that hackers use to find password-protected files or directories containing Facebook login credentials. The "intitle" part of the query is a search operator that tells search engines like Google to look for a specific phrase in the title of a webpage. In this case, the phrase is "index of password Facebook". intitle index of password facebook
