@cypnk This is another reason why password managers are so important. You can store more than passwords in them!
Q: What city were you born in?
A: Sigourney Weaver
Q: What is your father's middle name?
A: Porcupine
Q: What was the name of your first school?
A: Mint Chocolate Chip
That way, even if you get tricked into telling somebody the real answers it won't do them any good.
@truss Depends on what you mean by "most secure". If you mean "privacy/anonymity" then probably Qubes OS. If you mean a place to work on sensitive data that is safe relatively safe from hackers/crackers/jackers/thieves, then try UPR (Ubuntu Privacy Remix).