The Internet is a huge place.  With millions of websites on the Internet, most of the FREE information is questionable for its validity.  Besides checking your sources, see if you can find a backup source for the information.  If you can find the same information on multiple sights, then it is probably valid.  

The following is a checklist of questions that you can use in order to check your sources.

How to check your sources

1. Where does the information come from?
   1. Do they list their sources?
   2. Did they just write it themselves?
2. How does the website look?
   1. Layout
   2. Spelling
   3. Professional appeal
3. Who are the people publishing the web site?
   1. If a business, are they incorporated?
   2. If a organization, do they list how to join?
4. Where does the money come from?
   1. How do they pay for the website?
   2. Is the website covered with ads?
5. What is their agenda?
   1. Why are they publishing the website?
   2. How did you find the website?
6. What do other people think of the website?
   1. Is the site popular?
   2. What is the Google Page Rank?
7. What links are provided on the site?
   1. Contact
   2. About the company
   3. Privacy policy