Do not use Wikipedia. Because the information can be changed easily, it is not always a reliable source of information (although it might be okay to start there to familiarize yourself with terms and ideas that will help you do better research elsewhere). In 2009, a Member of Parliament (MP) in Great Britain publicly accused the Prime Minister of having his facts wrong on a topic. It turned out the MP’s facts were wrong, so a member of his staff changed some information on Wikipedia to match what his boss had said. This demonstrates how stupid the staff member was, but also how changeable the information on Wikipedia is. Even if you trust Wikipedia, will your reader?