Canva is an online graphic design tool that can help you create various items like presentations, graphics, posters, and so much more.  Sign up with your .edu email for an education account to get access to even more templates, backgrounds, graphics, etc. Canva also offers access to many free tutorials to learn how to design like a pro.  The lessons are short, show you how to use their tools, and discuss typography, color, design trends, and more. I highly recommend you check out the videos in the Design School, some of which are below.