Basic rules for self-protection:
1. Don’t trust everything that you read about a course written in a brochure / website.
2. Take whatever advice that “education counsellors” give with a grain of salt.
3. Be on your guard when the degree offerred has some kind of bombastic name.
What you can do:
4. Find out more about a course or subject with the help of Google. Ask some questions in forums that discuss education issues.
5 Check the people who are running the course, their credentials, research and teaching. Most faculties have basic information about their staff so this should be easy. Then, make your own judgment about whether these people are likely to be good mentors or not.
6. Send a couple of emails to people in the programme and evaluate their response to your queries.
If at the end you are still undecided about what you really want to study, do statistics.
P/S: Like all other naive students of my time, I broke Rules 1 to 4 (to be fair, Google was not born yet, and we used dial-ups). Luckily, I observed 5 and 6 and got into a programme that I really liked.