When you investigate a major, you're looking at the real-life applicability, implications, and usage of a major. Talking to people about their experiences in career fields and majors can broaden your perspective, helping you to see the good and the bad in order to make an informed decision.
Find all the different ways any major can be applied in the job market.
Finding out how real world professionals use their degrees in the field.
There are plenty of resources that can expose you to a degree's applicability.
A good place to keep your research and make sure you get the information you need.