Anyone can write and put stuff online. In contrast, things in the library (or on our website) generally go through a few steps that ensure some level of quality:
For these reasons, the library has a lot of good quality information and little bad information.
It costs money to write, review, and publish high-quality information. The companies behind this information rarely give it away for free. Unless you're willing to spend money, you will miss out on some good articles and books.
Fortunately, the library provides immediate access to much paid material -- and, once you know how the library works, you can really get just about anything through the library for free.
The library is no harder to use than Google. Both offer one search box that provides instant access to millions of results.
But only the library's tools offer free access to all of the results and very powerful options to limit your searches.