With discernment! Be sure to check the entry's primary sources and compare the information with traditional published references.
Google is a natural starting point for information search, but not always a good path for scholarly research. Here is a good overview of its strengths and weaknesses.
Questions for evaluating a website:
1. WHO is hosting this information? Who is the intended audience?
2. WHY has this website been created? What is the underlying agenda?
3. WHEN was the site created? When was it last updated?
4. WHAT is the source for the content? Is proper attribution given?
5. WHERE is the site located? Does the geography have an impact on the site and its contents?
The RICHEST source of information is available through proprietary databases and library collections. The Internet, good as it may be, is NEVER good enough.