I'm a junior in HS and I have an interest in math. I wanted to pursue some research in math but I have trouble deciding which subject since there's so many. I know calculus (I took Calc AB, learned derivatives, limits, integration, theorems; here is a good page summarizing the material) and so I was wondering if there are any good research topics in the calc field. But I'm open to suggestions of other areas of math. Can someone please suggest a research topics? Thanks.