Hi. I'm not sure if this is the right place for this kind of question, but it's related to coursework. I took Calc III during senior year of high school and linear algebra during freshman first semester. Then, I haven't taken any math class because I tried to fill my prereqs out and also take some premed courses (parents' idea) Anyway, I'll be taking differential equations the coming fall semester. What are some of the more important concepts that I need to really master before tackling differential equations? Thank you and sorry if there's a better place to ask this.