Passwords are case sensitive. This means that upper case (capital) letters and lower case (small) letters are treated differently. If you chose a password with upper and lower case letters, you must enter it in exactly the same way each time you log in. For example, the password 'LEMONADE1' is treated differently from 'Lemonade1'.
Answers are case sensitive. This means that upper case (capital) letters and lower case (small) letters are treated differently. If you chose a secret answer with upper and lower case letters, you must enter it in exactly the same way each time you log in.