Many sites or software tools prompt you to set a security (hint) question, which you may have to answer sometimes. Never set an answer that others can easily guess. E. g. if the question is "what is your birthplace?” some other person may be able to answer it and thereby successfully bypass the security check. So, if you have to set an answer you can set a fake answer that other people can’t guess.
E. g. you can set the answer to the question, "what is your birthplace?" to be “Delhi", whereas your actual birthplace is "Duliajan". If you have set a hint, write something that other people cannot easily guess.