It’s okay to use Wikipedia to find general information on a topic, but don’t stop there. Using Wikipedia as an official source for a research paper is a bad idea because not all of the information you can find there is verified and reliable. A lot of it is, but not all.
If you find a good Wikipedia page, be smart and check the works cited at the bottom of the page. Follow those links and using your web evaluation skills, find more credible sources and use those for your research.