Your topic has to embrace the requirements of the assignment as well as what you are genuinely interested in. Instructors generally require academic topics, but you might not yet be comfortable determining what academic topics are. These resources should help you find a topic that is academic and relevant, and that inspires you. Also, please don't hesitate to talk with your instructor or your librarian to help you find the best topic for you.
Once you have an idea, brainstorm some words that authors could use to describe that idea.These will become your search terms.