Information on the web is often more difficult to evaluate and deem reliable. Unlike the information you find in books, videos, and periodicals in the library, web information is usually not "filtered" or reviewed by editors or authorities on the subject prior to publication. Anyone, anywhere can post anything!
Does your resource pass the C.R.A.P. test?
Currency - Is it recent enough information for your needs?
Reliability - What kind of information is presented? Is it balanced? Does the author cite sources?
Authority - Who is the author and what are their credentials?
Purpose/Point-of-View - What is the intent of the resource? Does the author state facts or opinions?