I see a lot of posts on here asking what are some of the differences between planning and allied professions. If you are asking within the U.S. context, the American Planning Association’s Student Representative Council has been putting on an “Intersections” series to explain some of this. The next one is Planning: Civil Engineering on Friday, March 25, 2022. Their previous one, Planning: Architecture, was recorded and the video is on the same website. It’s free.
hope this helps.