Hi there, I am actually a designer before and now I'm a urban planner. For me, I found there are many common points between Urban Planning and Design, for example, they share the same basic design curriculum in early learning, have a good understanding of design is good for both. As a design major student, I recommend you to learn Planning related knowledge by yourself, thanks to technologies, we have more and more learning approaches from internet, you could find more on internet. For more details, you could leave a comment below. Good luck.