Internet Scams are becoming increasingly sophisticated and remarkably believable.
They're modern versions of the con-jobs than have been been around for centuries. Con-men earn your trust, then take your money. The Internet just makes it quicker and easier for crooks to find soft-hearted gullible (often elderly) victims.
The best thing to do is to learn about them, so you won't fall prey to these scammers.
Here's a list of popular scams and related information that's worth reading and watching.