Social Engineering is a thing to watch out for.
I've learnt to never answer honestly when they're asking stuff like "Where were you born?" "What's your first pet" etc.
Instead I've made up some answers that I'll never tell anyone else.
However that doesn't really make those details secure.
2FA is where it's at.
Yeah you can just scroll through someone's Facebook account for 'secret' answers. They're bound to have answered one of those "Your porn star is your first pet's name followed by the street you grew up on" things
A (random) English word is a better answer. Otherwise you can be phished by someone communicating with a phone rep.
"For security what's your pet's name?"
"I don't have a pet, I just put a bunch of random characters."
--
Due to implementation these questions are actually sometimes hard to answer truthfully sometimes. My fav teacher has a . in her name but "special characters" are not allowed in answers. My pet's name is 4 characters, too short. How did I answer my first car? Year, make, model? Make? Year and model? Just model? Who can remember?
Instead I've made up some answers that I'll never tell anyone else.
However that doesn't really make those details secure. 2FA is where it's at.