Just about anyone with an internet connection can post things on the internet. This means that there is potentially lots of junk out there. So how do you know the good from the bad? There are four things that can help you figure that out:
The URL tells you where the page has been created. URL’s ending in .gov are government websites and are good sources. Likewise with .edu and .ac which are academic websites. Sites ending with .com or .co should be treated with caution, as they could contain good or bad information.
Who created the page can also lend credibility to it. For example, if the page was created by a government or a NGO, then they are probably good sites. Any reputable company should have reputable information on it. If the site was created by one of the leading scholars in the field, then it too should be trusted. Sites where you cannot see an author should not be trusted easily. Using Wikipedia in an essay is generally a bad idea (unless your essay is about Wikipedia). Anyone can edit it, which means that you have no idea who the author is. What you can use on Wikipedia are the references. Follow those up, and see if you can find the source of the information.
Check language for bias (emotion-arousing language); is the info fact, opinion or propaganda;
If the site has spelling mistakes on it, then do not trust the information on it. If it has any factual errors, do not trust any other facts that it might state.
Always check the date that is attached to the information. Outdated information should be checked for relevancy.