Selection of a topic is not restricted to the list below, but you may find ideas that lead you to explore an area that interests you for your project.
The getting started list below gives you some great starting places with common language descriptions of mathematical terms.
To get started you can use general sources like Wikipedia to get a basic understanding of the topic and get a list of references. This content can give you an overview of your topic and lead to more scholarly sources.
Your primary sources, however, should be books and research articles - found in research journals, not just anywhere online. Verify definitions and facts in these sources.