It is important when starting the research process to understand not just what you are looking for but what you are looking AT. Books, articles, blog posts, videos, podcasts, and everything else you may come across are all created by individuals and groups who approach their work through the lens of their innate biases. Just as the experiences you have had in life have shaped how you think, so have their experiences shaped the people who created the material you find.
Information sources can be found online or in print, depending on how the publisher makes them available. This list will help you understand the benefits of using each of these types of sources.
Encyclopedias and Handbooks