How recently was the information created? Has the site been updated and maintained since the information was published? Does your topic require the newest information or is it historical?
Does the author give you sources/citations to indicate where the information came from? Are claims backed up with verifiable evidence? Is the information skewed to one point of view?
Who wrote the information? Who published it? Are they experts on the subject? What are their credentials?
Is the source designed to inform or persuade? What is the domain of the site (.gov or .com etc.)? How much of the site is ads? Do they relate to the information being presented? Why does the resource exist?