I am using HitFilm 2017 Express to put together a few clips recorded by an iPhone (1920 x 1080 @ 29.97fps).
I see some video settings in my project tab:
When I export my video, I see even more settings - some of which are duplicated across both:
I understand that my export settings are what I actually get in the rendered file. What confuses me is the project's video settings (first picture). Why do I even have them? How do they relate to and/or affect the final production?