Look for professional or academic credentials qualifying the author to write on the topic. The Web is notorious for ax-grinding opinion pages. Some Web Sites are for fun, others are outright lies. A date could be when the page was written or when it was first put on the Web. A date can also indicate when a page was last updated.
Links can lead to long gone sites or sites that have moved.
Select WWW Select one of the style manuals located under Citing Electronic Sources. Pick up a copy of APA Documentation or MLA Documentation at the Information Desk on the 1st floor of the Library.