Unlike the library's databases, Google does not filter or rank its results by the accuracy of their claims. Therefore, it is important to be a vigilant fact-checker when investigating sources in your Google search results.
When you are on a website you do not recognize, you can perform a "lateral search" by opening a new tab and searching for information about that source on Google or Wikipedia. Here are some factors to consider when investigating a source:
Bias can appear in any source (e.g. newspapers, blog posts, etc). You may detect biased language, or you may find through a lateral Google search that the website containing the source is "progressive" or "conservative."
The presence of bias DOES NOT mean the source is unusable. There may be factual and accurate claims the author is making. However, in sources containing bias, you need to do a little more lateral searching to verify the specific claims in the source you wish to use.