I look online for information. A book is a great thing if you just want to quickly look up an answer to something, but it never changes with the information that is in the book, whereas the Internet is always updating with new information being uploaded as we learn new things about a topic.
A book only has one opinion, that of the author, so that is all you get from looking there for information, but when you look online, you will find thoughts both pro and con the subject.
So, if you are thinking about giving your pet a vaccination, for example, then you can read about the benefits of doing that, and also about vaccines carrying other diseases, and the dangers that giving them to your pet could cause.
I think it is always good to be able to check out all the information, ad the Internet is usually the est way to do that.