Before using any information you should critically evaluate source, especially if it is from a website.  

Put it through the CRAAP Test: 

CURRENCY: Is the material current? Does it contain outdated or disproven information? Is the site updated regularly?

RELEVANCE: 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