When information is needed the following website provide lists of reviewed sites. The reviewers are experts so you can feel confident using their recommendations.
Where you aren't sure the following websites list bogus health information
Snopes was started to debunk urban legends (woman fries cat in microwave) but has gone on to investigate anything that is questionable. It is reliable.
Webnames.ca gives steps you can take to check a website for validity.
List of Fake Websites from Wikipedia
Your local college and public libraries also offer links to reviewed and reliable websites.