There are also some "random dudes" in this forum and we should be careful on encountering them. I saw one post in here that within 24 hrs he can double your bitcoins. It's an obvious scam so, we should not trust anybody that comes on our way. But the best thing to prevent doing mistakes is to research on that topic. By that, you can avoid being scammed by people. Not only from these random dudes but also in investing on cryptocurrency.