Web resources can be rich sources of information on a topic, but when conducting research, it's important to consider the quality and accuracy of sites you visit on the open web. Use the CRAPP test to determine whether a web resource is trustworthy: 

Wikipedia is a great resource. But don't use it as one of your cited references. Use it instead as a source of general background information plus a pointer to other resources, often listed at the bottom of a good Wikipedia article. For a discussion of the reliability of Wikipedia

How does Wikipedia work  to keep the information it provides accurate?

Here are some resources from Wikipedia that address this question.

1. Below retrieved October 25 from https://en.wikipedia.org/wiki/Wikipedia:About

Since its creation in 2001, Wikipedia has grown rapidly into one of the largest reference websites, attracting 374 million unique visitors monthly as of September 2015.^[1] There are about 71,000 active contributors working on more than 46,000,000 articles in 299 languages. As of today, there are 5,498,542 articles in English. Every day, hundreds of thousands of visitors from around the world collectively make tens of thousands of edits and create thousands of new articles to augment the knowledge held by the Wikipedia encyclopedia. (See the statistics page for more information.) People of all ages, cultures and backgrounds can add or edit article prose, references, images and other media here. What is contributed is more important than the expertise or qualifications of the contributor. What will remain depends upon whether the content is free of copyright restrictions and contentious material about living people, and whether it fits within Wikipedia's policies, including being verifiable against a published reliable source, thereby excluding editors' opinions and beliefs and unreviewed research. Contributions cannot damage Wikipedia because the software allows easy reversal of mistakes and many experienced editors are watching to help ensure that edits are cumulative improvements. Begin by simply clicking the Edit link at the top of any editable page!

Wikipedia is a live collaboration differing from paper-based reference sources in important ways. Unlike printed encyclopedias, Wikipedia is continually created and updated, with articles on historic events appearing within minutes, rather than months or years. Because everybody can help improve it, Wikipedia has become more comprehensive than any other encyclopedia. In addition to quantity, its contributors work on improving quality as well. Wikipedia is a work-in-progress, with articles in various stages of completion. As articles develop, they tend to become more comprehensive and balanced. Quality also improves over time as misinformation and other errors are removed or repaired. However, because anyone can click "edit" at any time and add stuff in, any article may contain undetected misinformation, errors, or vandalism. Awareness of this helps the reader to obtain valid information, avoid recently added misinformation (see Wikipedia:Researching with Wikipedia), and fix the article.

2.Wikipedia does self-police. For more information about how this works, see the policies and guidelines, including the section about "enforcement" Also, to see self-policing in action, see the talk section of a page.

3. Information about how to edit a Wikipedia article is available here.

4. Here is some information about studies concerning how quickly misinformation is corrected on Wikipedia.