Frauds are when someone tells you something that's not true or does something bad to trick you out of money or something else valuable. It's like if someone tries to sell you a fake toy, or if someone says they'll give you a special prize if you give them your password. It's not fair or honest behavior, and it's important to be careful and not fall for frauds.
Myths are stories or beliefs that people have been telling for a long time, but might not be true. They're like fairy tales or legends, and some people believe them even though they haven't been proven. For example, some people used to believe that the world was flat, but we now know that's not true because of science and research.
Mysteries are things that we don't know the answer to yet. They're like puzzles that we're still trying to solve. For example, if something strange happens and we don't know why, or if we find a hidden treasure but don't know who left it there, those are mysteries. It's exciting to try to figure out the answers to mysteries, but sometimes we might never know for sure.