Before using any information you should critically evaluate source, especially if it is from a website.
Put it through the CRA(A)P Test:
CURRENCY: Is the material current? Does it contain outdated or disproven information? Is the site updated regularly?
RELEVANCE/RELIABILITY: Does the source answer your questions? Does it provide useful information? Is it too complicated to understand or too elementary?
AUTHORITY: Who is the author? What can you find out about them? Can you determine their credentials? Are they a qualified expert? Is the author's contact info listed?
(ACCURACY: What evidence does the author use? Are facts documented? Is there a bibliography?)
PURPOSE: Why was the information created: to inform, to sell, to persuade? Is it fact or opinion? Is the information biased?
The CRAAP Test was created by Merriam Library, California State University at Chico