You may not know a lot about your topic before you get started. When you first start seeking information on your topic, you're likely to search for the basics: a general understanding of the history, terminology, and major events or people involved. The goal is to become well-versed in the basics so you may begin to research at a more advanced level. Consider this the "Wikipedia Stage."
Wikipedia Stage
It is perfectly acceptable to use Wikipedia as a reference for general information. Use Wikipedia as a place to get familiar with your topic - not as a definitive source for your paper. It will provide common knowledge about your topic, and you will likely come across this information again in more credible sources discovered in the library's databases. If you can't find an appropriate Wikipedia page for your topic, simply do a search in Google and browse through your results.
These other sources may be beneficial as well:
Your Textbook
Your textbook can provide excellent background information on course-related topics. It also can recommend additional resources, such as specific books and other texts.
Your Professor
Your professor may be able to provide a quick introduction to your topic - especially if the topic was assigned. Don't be afraid to ask for clarification or additional information.
Supplemental Course Materials
You know those course materials your professor mentions on the syllabus or in Canvas? Use them! They were recommended for a reason.
Reference Materials
The library has a number of reference materials that can provide background information. The Very Short Introductions database from Oxford University Press would be an excellent place to start. Contact your librarian if you have questions or need assistance.