Doing research about jobs you are interested in can take many forms. The easiest would be to search online for information. You can do this by looking at a company’s website, reviewing search sites such as glassdoor.com, searching for people on LinkedIn with that job title to see their profiles, and looking at the Occupational Outlook Handbook to gain insight into the role in general.
While that information is easy to find, it is often incomplete. If you still have questions, the best way to learn about a position is to talk to someone who is in the role. You can do this by conducting informational interviews. You could even ask to do a job shadow, to gain further insight into what the job actually entails.
For more ideas on how to have an effective job search, review our Conducting a Job Search section and our Job Search on-demand tutorial.